Title: Users will see a frozen white screen when attempting to sign into the OneDrive for Business sync app
User impact: Users will see a frozen white screen when attempting to sign into the OneDrive for Business sync app.
Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 30 minutes.

Current status: We're reviewing system logs to isolate the origin of this issue.
Scope of impact: Your organization is affected by this event, and any user may experience impact.
Next update by: Wednesday, September 22, 2021, at 6:00 PM UTC

More info: As our investigation continues, we've confirmed with affected users that disabling Export Address Filtering (EAF) is a potential workaround to alleviate the impact. Admins who wish to do so can navigate to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF).
Current status: We're continuing our review of the available system logs to determine the underlaying cause of this issue.
Scope of impact: Your organization is affected by this event, and any user may experience impact.
Next update by: Wednesday, September 22, 2021, at 7:00 PM UTC

More info: This issue might affect users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.
Admins who wish to do so can navigate to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF) and mitigate the impact.
Alternatively, this issue can be mitigated using Known Issue Rollback (KIR): https://techcommunity.microsoft.com/t5/windows-it-pro-blog/known-issue-rollback-helping-you-keep-windows-devices-protected/ba-p/2176831.
For enterprise-managed devices that have installed an affected update and encountered this issue, it can be mitigated by installing and configuring a special Group Policy installed via an MSI file available for:
- Windows 10, version 1809 and Windows Server 2019: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 1909: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 2004, Windows 10, version 20H2 and Windows 10, version 21H1: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(2004%20,%2020H2%20and%2021H1)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows Sever 2022: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%20Server%202022%20Known%20Issue%20Rollback%20091821%2001.msi
Note: Devices will need to be restarted after configuring the special Group Policy. For help, please see the following: https://docs.microsoft.com/en-us/troubleshoot/windows-client/group-policy/use-group-policy-to-deploy-known-issue-rollback
For general information on using Group Policies, see: https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/hh831791(v=ws.11)
Please note that many Mobile Device Manager (MDM) customers can't deploy group policies. Customers unable to deploy group policy settings for the KIR should open support cases for further assistance.
Current status: We've confirmed that a recent Windows patch deployment inadvertently introduced an EAF issue that's contributing to the impact. We've successfully reproduced the issue locally to test potential long-term solutions to resolve this problem. As we focus on a permanent solution, we've confirmed with affected users that following the steps in the KIR provided or disabling EAF are both functioning as a successful workaround to mitigate the impact.
Scope of impact: Any user may be prevented from signing into the OneDrive for Business sync app.
Root cause: A recent Windows patch deployment inadvertently introduced an Export Address Filtering (EAF) issue that's contributing to the impact.
Next update by: Wednesday, September 22, 2021, at 9:00 PM UTC

More info: This issue might affect users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.

We've confirmed that users with Mobile Device Management (MDM) enabled devices can add the following reg key as a workaround: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 2767781516 /t REG_DWORD /d 0 /f

We've also confirmed with affected users that disabling Export Address Filtering (EAF) is a potential workaround to alleviate the impact. Admins who wish to do so can navigate to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF) and mitigate the impact.

Alternatively, this issue can be mitigated using Known Issue Rollback (KIR):
https://techcommunity.microsoft.com/t5/windows-it-pro-blog/known-issue-rollback-helping-you-keep-windows-devices-protected/ba-p/2176831.

For enterprise-managed devices that have installed an affected update and encountered this issue, it can be mitigated by installing and configuring a special Group Policy installed via an MSI file available for:

- Windows 10, version 1809 and Windows Server 2019: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi

- Windows 10, version 1909: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi

- Windows 10, version 2004, Windows 10, version 20H2 and Windows 10, version 21H1: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(2004%20,%2020H2%20and%2021H1)%20Known%20Issue%20Rollback%20091721%2001.msi

- Windows Sever 2022: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%20Server%202022%20Known%20Issue%20Rollback%20091821%2001.msi

Note: Devices will need to be restarted after configuring the special Group Policy. For help, please see the following:
https://docs.microsoft.com/en-us/troubleshoot/windows-client/group-policy/use-group-policy-to-deploy-known-issue-rollback

For general information on using Group Policies, see:
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/hh831791(v=ws.11)

Please note that many Mobile Device Management (MDM) customers can't deploy group policies. Customers unable to deploy group policy settings for the KIR should open support cases for further assistance.
Current status: While focused on expediting a permanent fix for this issue, we've confirmed another workaround for users with Mobile Device Management (MDM) enabled devices by adding a specific reg key provided in the "more info" section.
Scope of impact: Any user may be prevented from signing into the OneDrive for Business sync app.
Root cause: A recent Windows patch deployment inadvertently introduced an Export Address Filtering (EAF) issue that's contributing to the impact.
Next update by: Friday, September 24, 2021, at 11:00 PM UTC

More info: This issue might affect users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.
Users can mitigate impact by following the steps within the Known Issue Rollback (KIR) article: https://techcommunity.microsoft.com/t5/windows-it-pro-blog/known-issue-rollback-helping-you-keep-windows-devices-protected/ba-p/2176831.
For enterprise-managed devices that have installed an affected update and encountered this issue, it can be mitigated by installing and configuring a special Group Policy installed via an MSI file available for: - Windows 10, version 1809 and Windows Server 2019: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 1909: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 2004, Windows 10, version 20H2 and Windows 10, version 21H1: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(2004%20,%2020H2%20and%2021H1)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows Server 2022: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%20Server%202022%20Known%20Issue%20Rollback%20091821%2001.msi
Note: Devices will need to be restarted after configuring the special Group Policy. For help, please see the following: https://docs.microsoft.com/en-us/troubleshoot/windows-client/group-policy/use-group-policy-to-deploy-known-issue-rollback
For general information on using Group Policies, see: https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/hh831791(v=ws.11)
We've confirmed that users with Mobile Device Management (MDM) enabled devices can add reg keys as a workaround. The following below will need to be implemented, depending on your organization’s server version:
Windows Server 2022: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 2801335948 /t REG_DWORD /d 0 /f
Windows 10, version 2004, Windows 10, version 20H2 and Windows 10, version 21H1: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 2767781516 /t REG_DWORD /d 0 /f
Windows 10, version 1909: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 928713355 /t REG_DWORD /d 0 /f
Windows 10, version 1809, Windows Server 2019: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 2371422858 /t REG_DWORD /d 0 /f
Alternatively, we've also confirmed with affected users that disabling Export Address Filtering (EAF) is a potential workaround to alleviate the impact. Admins who wish to do so can navigate to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF) and mitigate the impact.
Please note that many Mobile Device Management (MDM) customers can't deploy group policies. Customers unable to deploy group policy settings for the KIR should open support cases for further assistance.
Current status: We've prepared a fix for this issue and are preparing it for deployment through our change management protocols. Due to the complexity and nature of our solution, we expect this process to take several weeks to complete. In the interim, users are encouraged to leverage the workarounds provided above.
Scope of impact: Any user may be prevented from signing into the OneDrive for Business sync app.
Preliminary root cause: A recent Windows patch deployment inadvertently introduced an Export Address Filtering (EAF) issue that's contributing to the impact.
Next update by: Monday, October 11, 2021, at 11:30 PM UTC

More info: This issue might affect users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.
We recommend implementing the Known Issue Rollback (KIR) or manually adding the registry keys if users need immediate relief. Details on how to implement these workarounds can be found through the following link: https://docs.microsoft.com/en-us/windows/release-health/status-windows-10-21h1#1696msgdesc
Alternatively, we've also confirmed with affected users that disabling Export Address Filtering (EAF) is a potential workaround to alleviate the impact. Admins who wish to do so can navigate to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF) and mitigate the impact.
Please note that many Mobile Device Management (MDM) customers can't deploy group policies. Customers unable to deploy group policy settings for the KIR should open support cases for further assistance.
Current status: We're working through final preparations to deploy the fix for the affected customers, and we’ll provide an updated ETA as soon as it becomes available. In the interim users are encouraged to leverage the workarounds provided above.
Scope of impact: Any user may be prevented from signing into the OneDrive for Business sync app.
Preliminary root cause: A recent Windows patch deployment inadvertently introduced an Export Address Filtering (EAF) issue that's contributing to the impact.
Next update by: Wednesday, October 20, 2021, at 11:30 PM UTC

Title: Users will see a frozen white screen when attempting to sign into the OneDrive for Business sync app
User Impact: Users would have seen a frozen white screen when attempting to sign into the OneDrive for Business sync app.
More info: This issue might have affected users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.
We've confirmed that users with Mobile Device Management (MDM) enabled devices could have added the following reg key as a workaround:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 2767781516 /t REG_DWORD /d 0 /f
We've also confirmed with affected users that disabling Export Address Filtering (EAF) was a potential workaround to alleviate the impact. Admins who wished to do so could have navigated to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF) and mitigated the impact.
Alternatively, this issue could have been mitigated using Known Issue Rollback (KIR): https://techcommunity.microsoft.com/t5/windows-it-pro-blog/known-issue-rollback-helping-you-keep-windows-devices-protected/ba-p/2176831.
For enterprise-managed devices that have installed an affected update and encountered this issue, it could have been mitigated by installing and configuring a special Group Policy installed via an MSI file available for:
- Windows 10, version 1809 and Windows Server 2019: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 1909: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 2004, Windows 10, version 20H2 and Windows 10, version 21H1: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(2004%20,%2020H2%20and%2021H1)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows Server 2022: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%20Server%202022%20Known%20Issue%20Rollback%20091821%2001.msi
Note: Devices needed to be restarted after configuring the special Group Policy. For help, users could have reviewed the following:
https://docs.microsoft.com/en-us/troubleshoot/windows-client/group-policy/use-group-policy-to-deploy-known-issue-rollback
For general information on using Group Policies, see:
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/hh831791(v=ws.11)
Please note that many Mobile Device Management (MDM) customers couldn't deploy group policies. Customers that were unable to deploy group policy settings for the KIR may have opened support cases for further assistance.
Final status: After an extended period of monitoring, we have confirmed that the fix within the October Windows update successfully resolves the issue and affected users have reported relief. Any user still experiencing impact will need to initiate the update on their device to remediate the issue.
Scope of impact: Any user may have been prevented from signing into the OneDrive for Business sync app.
Start time: Monday, September 13, 2021, at 8:26 PM UTC
End time: Tuesday, October 12, 2021, at 5:00 PM UTC
Preliminary root cause: A recent Windows patch deployment inadvertently introduced an Export Address Filtering (EAF) issue that's contributed to the impact.
Next steps: - We're reviewing our update procedures to better identify similar issues during our development and testing cycles. - We're reviewing our standard service update procedures to avoid similar impact in the future.
We'll publish a post-incident report within five business days.

Resolved

More info: This issue might affect users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.
This issue might affect users who have the Microsoft Exploit Protection EAF (Export Address Filtering) feature enabled and have installed the September security updates.
We've confirmed that users with Mobile Device Management (MDM) enabled devices can add the following reg key as a workaround: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 2767781516 /t REG_DWORD /d 0 /f
We've also confirmed with affected users that disabling Export Address Filtering (EAF) is a potential workaround to alleviate the impact. Admins who wish to do so can navigate to Windows Security > App & Browser Control > Exploit Protection Settings > Program Settings > OneDrive.exe > Turn off Export Address Filtering (EAF) and mitigate the impact.
Alternatively, this issue can be mitigated using Known Issue Rollback (KIR):
https://techcommunity.microsoft.com/t5/windows-it-pro-blog/known-issue-rollback-helping-you-keep-windows-devices-protected/ba-p/2176831.
For enterprise-managed devices that have installed an affected update and encountered this issue, it can be mitigated by installing and configuring a special Group Policy installed via an MSI file available for:
- Windows 10, version 1809 and Windows Server 2019: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 1909: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(1903%20&%201909)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows 10, version 2004, Windows 10, version 20H2 and Windows 10, version 21H1: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%2010%20(2004%20,%2020H2%20and%2021H1)%20Known%20Issue%20Rollback%20091721%2001.msi
- Windows Sever 2022: https://download.microsoft.com/download/7/f/1/7f194890-eea9-4cad-b19f-25ab67e41bbe/Windows%20Server%202022%20Known%20Issue%20Rollback%20091821%2001.msi
Note: Devices will need to be restarted after configuring the special Group Policy. For help, please see the following:
https://docs.microsoft.com/en-us/troubleshoot/windows-client/group-policy/use-group-policy-to-deploy-known-issue-rollback
For general information on using Group Policies, see:
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/hh831791(v=ws.11)
Please note that many Mobile Device Management (MDM) customers can't deploy group policies. Customers unable to deploy group policy settings for the KIR should open support cases for further assistance.
Current status: The fix has been deployed and is contained within the October Windows update. Users will need to initiate the update on their device to remediate the issue.
Scope of impact: Any user may be prevented from signing into the OneDrive for Business sync app.
Preliminary root cause: root cause: A recent Windows patch deployment inadvertently introduced an Export Address Filtering (EAF) issue that's contributing to the impact.
Next update by: Friday, October 22, 2021, at 11:30 PM UTC

Title: Mac users may be unable to sign into or run multiple OneDrive accounts on a single device
User Impact: Mac users may be unable to sign into or run multiple OneDrive accounts on a single device.
More info: This problem mostly affects users attempting to sign into both a personal account and a business account on the same device, but also impacts users signing into two business accounts. The issue only impacts users who have updated their devices to macOS 11.6. The issue also impacts both the OneDrive for Mac standalone sync client and the OneDrive on the Mac app acquired through the App Store.
Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.
Scope of impact: This issue could impact any of your Mac users who recently updated to macOS 11.6 and are attempting to sign into multiple OneDrive accounts on the same device.

More info: This problem mostly affects users attempting to sign into both a personal account and a business account on the same device, but also impacts users signing into two business accounts. The issue only impacts users who have updated their devices to macOS 11.6. The issue also impacts both the OneDrive for Mac standalone sync client and the OneDrive on the Mac app acquired through the App Store.
Current status: We're reviewing system logs to determine if the macOS update is a contributing factor for this issue.
Scope of impact: This issue could impact any of your Mac users who recently updated to macOS 11.6 and are attempting to sign into multiple OneDrive accounts on the same device.
Next update by: Tuesday, September 14, 2021, at 9:00 PM UTC

More info: This problem mostly affects users attempting to sign into both a personal account and a business account on the same device, but also impacts users signing into two business accounts. The issue only impacts users who have updated their devices to macOS 11.6. The issue also impacts both the OneDrive for Mac standalone sync client and the OneDrive on the Mac app acquired through the App Store.
Current status: We're working with Apple to better understand multi-account OneDrive for Business compatibility issues for Mac devices that started with the release and adoption of macOS 11.6 to better understand the underlying cause and to develop a solution.
Scope of impact: This issue could impact any of your Mac users who recently updated to macOS 11.6 and are attempting to sign into multiple OneDrive accounts on the same device.
Next update by: Wednesday, September 15, 2021, at 10:00 PM UTC

More info: This problem mostly affects users attempting to sign into both a personal account and a business account on the same device, but also impacts users signing into two business accounts. The issue only impacts users who have updated their devices to macOS 11.6. The issue also impacts both the OneDrive for Mac standalone sync client and the OneDrive on the Mac app acquired through the App Store.
Current status: We've developed and are validating a temporary fix for the OneDrive for Mac standalone sync client that will allow affected users to again utilize multiple OneDrive accounts, both personal and business, on the same macOS 11.6 updated device. Once testing and validation is complete, we'll provide an estimate on the deployment timeline. In parallel, we're looking into workarounds for users that leverage the OneDrive on the Mac app acquired through the App Store.
Scope of impact: This issue could impact any of your Mac users who recently updated to macOS 11.6 and are attempting to sign into multiple OneDrive accounts on the same device.
Next update by: Thursday, September 16, 2021, at 1:00 AM UTC

More info: This problem mostly affects users attempting to sign into both a personal account and a business account on the same device, but also impacts users signing into two business accounts. The issue only impacts users who have updated their devices to macOS 11.6. The issue also impacts both the OneDrive for Mac standalone sync client and the OneDrive on the Mac app acquired through the App Store.
Current status: We've developed and are validating a temporary fix for the OneDrive for Mac standalone sync client that will allow affected users to again utilize multiple OneDrive accounts, both personal and business, on the same macOS 11.6 updated device. Once testing and validation is complete, we'll provide an estimate on the deployment timeline. In parallel, we're looking into workarounds for users that leverage the OneDrive app on macOS acquired through the App Store.
Scope of impact: This issue could impact any of your Mac users who recently updated to macOS 11.6 and are attempting to sign into multiple OneDrive accounts on the same device.
Start time: Monday, September 13, 2021, at 7:00 AM UTC
Next update by: Thursday, September 16, 2021, at 9:00 PM UTC

More info: This problem mostly affects users attempting to sign into both a personal account and a business account on the same device, but also impacts users signing into two business accounts. The issue only impacts users who have updated their devices to macOS 11.6. The issue also impacts both the OneDrive for Mac standalone sync client and the OneDrive on the Mac app acquired through the App Store.
OneDrive for Mac standalone sync client users can manually download the updated build with a fix if they haven't automatically received it from the following link: https://oneclient.sfx.ms/Mac/Prod/21.160.0808.0004/OneDrive.zip
Current status: The OneDrive for Mac standalone sync client fix has completed and most users should have automatically received this update, although it may take a few more hours to reach some users that haven't yet received it. Users can also manually download the updated build that includes the fix at: https://oneclient.sfx.ms/Mac/Prod/21.160.0808.0004/OneDrive.zip. We're continuing to review how the OneDrive app on macOS acquired through the App Store is specifically affected by this problem.
Scope of impact: This issue could impact any of your Mac users who recently updated to macOS 11.6 and are attempting to sign into multiple OneDrive accounts on the same device.
Start time: Monday, September 13, 2021, at 7:00 AM UTC
Next update by: Friday, September 17, 2021, at 9:30 PM UTC

OneDrive for Mac standalone sync client users could have manually downloaded the updated build with a fix if they hadn't automatically received it from the following link: https://oneclient.sfx.ms/Mac/Prod/21.160.0808.0004/OneDrive.zip
Final status: We've developed and deployed an additional fix for the OneDrive app through the App Store that is now available and impacted users can manually update their app to immediately resolve this issue. As previously mentioned, the OneDrive for Mac standalone sync client fix has been completed and users can manually download the updated build that includes the fix at: https://oneclient.sfx.ms/Mac/Prod/21.160.0808.0004/OneDrive.zip if their clients aren't already updated automatically.
Scope of impact: This issue could have impacted any of your Mac users who recently updated to macOS 11.6 and were attempting to sign into multiple OneDrive accounts on the same device.
Start time: Monday, September 13, 2021, at 7:00 AM UTC
End time: Friday, September 17, 2021, at 12:00 AM UTC
Root cause: A compatibility issue between macOS 11.6 and multi-account OneDrive for Business facilitation resulted in access issues for Mac users attempting to access multiple accounts from a single device.
This is the final update for the event.

Title: Users' OneDrive for Business storage limits are lower than expected
User Impact: Users' OneDrive for Business storage limits are lower than expected.
Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 30 minutes.
Scope of impact: Your organization is affected by this event, and any user may have lower than expected limits for their OneDrive for Business storage.

Current status: We're reviewing available system data to determine possible underlying causes of this issue.
Scope of impact: Your organization is affected by this event, and any user may have lower than expected limits for their OneDrive for Business storage.
Next update by: Thursday, August 26, 2021, at 7:30 AM UTC

More info: Some users may also be in read-only mode during this event.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: We're continuing to review our available system data, whilst additionally working with your representatives to gather diagnostic logs to isolate the root cause of impact.
Scope of impact: Your organization is affected by this event, and any user may have lower than expected limits for their OneDrive for Business storage.
Next update by: Thursday, August 26, 2021, at 9:30 AM UTC

More info: For any content which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: We've determined from the gathered logs that an exception is not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB. We're changing the way the quota is calculated, which should mitigate the issue.
Scope of impact: Impact is specific to users who are served through the affected infrastructure.
Next update by: Thursday, August 26, 2021, at 11:30 AM UTC

More info: As a workaround, admins can individually set the quota for impacted users.
https://docs.microsoft.com/en-us/onedrive/change-user-storage
We'd like to get your feedback on the workaround we provided. From a non-mobile device, please rate this post and submit it in the textbox.
For any content which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: We're preparing to revert recent changes made to the quota settings to resolve the issue.
Scope of impact: Impact is specific to users who are served through the affected infrastructure.
Root cause: An exception is not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, August 26, 2021, at 1:00 PM UTC

Engineers are working on scaling the solution across the affected customers. This involves analysis of change log per tenant, align the user quota to the user licence and reverting user's quota to previously set state.

More info: As a workaround, admins can individually set the quota for impacted users.
https://docs.microsoft.com/en-us/onedrive/change-user-storage
We'd like to get your feedback on the workaround we provided. From a non-mobile device, please rate this post and submit it in the textbox.
For any content which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: We've identified a fix that involves reverting the recent changes in addition to re-aligning user quotas to what they are licensed for and reverting user's quota to previously set state.
Scope of impact: Impact is specific to users who are served through the affected infrastructure.
Root cause: An exception is not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, August 26, 2021, at 3:00 PM UTC

Engineers are validating the mitigation on a sample of affected users and if successful, it will be deployed across the affected tenants.

More info: As a workaround, admins can individually set the quota for impacted users.
https://docs.microsoft.com/en-us/onedrive/change-user-storage
We'd like to get your feedback on the workaround we provided. From a non-mobile device, please rate this post and submit it in the textbox.
For any content which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: We're gathering the list of affected users in order to apply the mitigation steps. Meanwhile, we're validating our mitigation steps with a sample of users before applying them to all of the affected infrastructure.
Scope of impact: Impact is specific to users who made changes to their quota settings from approximately the 13th August to approximately the 25th August, when the impacting change was made.
Root cause: An exception is not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, August 26, 2021, at 5:00 PM UTC

More info: For any content which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
We'd like to get your feedback on the workaround we provided. From a non-mobile device, please rate this post and submit it in the textbox.
Current status: We've validated that the mitigation steps successfully resolve this issue and we'll begin deployment once the full scope of impacted users has been determined. Our effort to determine the full scope of impacted users is ongoing, and due to the complex nature of this activity, make take an extended amount of time to complete.
Scope of impact: Impact is specific to users who made changes to their quota settings from approximately August 13, 2021, to approximately August 25, 2021, when the impacting change was made.
Preliminary root cause: An exception is not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, August 26, 2021, at 7:00 PM UTC

We've determined that the previously provided workaround is not viable or functioning as expected for all affected users and have removed that guidance from this message. We apologize for any inconvenience or confusion this may have caused.
This quick update is designed to give the latest information on this issue.

We're continuing to monitor customer feedback and are adjusting our messaging in an effort to make it more clear.
Our understanding of the issue is evolving and real time customer feedback is invaluable and appreciated. From a non-mobile device, please rate this post and let us know if our updates have provided greater clarity via the text box.
This quick update is designed to give the latest information on this issue.

More info: For any quota which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
We'd like to get your feedback on the workaround we provided. From a non-mobile device, please rate this post and submit it in the textbox.
Current status: We’ve initiated the deployment of the fix in a limited environment to ensure it resolves impact as expected. Once confirmed, we’ll proceed with expanding the deployment to all affected users. By design, this fix is expected to restore all affected users to the default storage quota of five terabytes.
Scope of impact: Further investigation has identified that this issue may impact users outside of the previously communicated timeframe, we apologize for any inconvenience or confusion this may have caused. Currently, our telemetry indicates that this issue affects a larger subset of users worldwide, including those not within the aforementioned criteria.
Preliminary root cause: An exception is not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, August 26, 2021, at 9:00 PM UTC

More info: For any quota which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: The targeted deployment remediated impact as expected, and we’re in the process of expanding the deployment to all affected users. We’ll continue to monitor the environment while the fix saturates to ensure it completes successfully.
Scope of impact: This issue affects a larger subset of users worldwide.
Preliminary root cause: An error occurred, resulting in the system not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, August 26, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: The deployment has completed successfully. Additionally, we’ve identified that the fix will take approximately 24 hours to take full effect. We’ll continue to closely monitor the environment during this timeframe to ensure the service remains in a healthy state, and that the fix progresses as intended.
Scope of impact: This issue affects a large subset of users worldwide.
Estimated time to resolution: Friday, August 27, 2021, at 10:00 PM UTC
Preliminary root cause: A misconfiguration that resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Friday, August 27, 2021, at 11:00 PM UTC

More info: The mitigation activity does not impact unique storage quotas and will not revert quotas set by admins. If no value was set, the fix will align to the larger tenant level quota.
For any quota which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
Current status: Our telemetry indicates that the fix has taken full effect for users that have default and or non-custom quotas, though some users may see a delay in mitigation until they navigate to their OneDrive for Business account via the web, which will initiate a backend refresh.
Additionally, we have received some reports that this issue is not resolved for users with custom quotas. Further investigation is required to confirm this behavior.
Scope of impact: This issue affects a large subset of users worldwide.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Saturday, August 28, 2021, at 5:00 AM UTC

More info: For any quota which exceeds the 1TB storage quota, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: Our data continues to indicate that the fix is progressing and users are experiencing incremental resolution if they have a default or non-custom quota set. We're expecting some users may see a delay and if necessary can expedite this process by navigating to their OneDrive for Business account via the web.
Additionally, we've determined that some users who have a custom quota set were impacted by this issue. Our initial investigation did not properly account for a specific variable and we have adjusted our telemetry to ensure we have identified all impacting scenarios.
We're working on a fix to address users in this state and will provide a recovery timeline as soon as possible. We have provided an interim solution that may be viable for some admins that can be found in the 'More Info' section above.
We understand how impacting this issue has on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Saturday, August 28, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
For customers with non-set quotas, we're expecting some users may see a delay in mitigation, and if necessary, can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: Our telemetry indicates the fix continues to progress for users with a default or non-custom quota set.
As we've determined that some users who have a custom quota set were impacted by this issue, we’re in the process of developing and testing a separate mitigation activity that will temporarily increase the quota to a value greater than 1TB, and then subsequently apply the correct value. Similar to the fix for non-custom quotas, this mitigation activity will require users to initiate a refresh activity such as navigating to the OneDrive for Business account via the web. We expect development of this mitigation to be completed over the weekend, and for deployment to begin early next week.
In tandem, and to accelerate this process for both users with default quotas and custom quotas, we’re developing a mitigation activity to initiate an automated refresh, which will automatically revert the quota to the correct value.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Monday, August 30, 2021, at 12:00 AM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
For customers with non-set quotas, we're expecting some users may see a delay in mitigation, and if necessary, can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: We’ve completed development of the mitigation for users with custom quotas and are completing final validations prior to deployment. Additionally, our effort to develop a mitigation activity to initiate an automated refresh is ongoing.
Our telemetry indicates the initial mitigation activity continues to provide relief for users with a default or non-custom quota set.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Monday, August 30, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
For customers with non-set quotas, we're expecting some users may see a delay in mitigation, and if necessary, can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: In order to ensure we’re following safe deployment practices, we’re in the process of completing our final validations within our internal environments prior to initiating a targeted release. Our development of a mitigation activity to initiate an automated refresh is ongoing.
Our monitoring indicates users with a default or non-custom quota set continue to see relief.
We understand how impacting this issue has on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Tuesday, August 31, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
For customers with non-set quotas, we're expecting some users may see a delay in mitigation, and if necessary, can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: We’ve completed the validation process and are deploying our solution for users with applied custom quotas. We’ll continue to monitor the deployment as it progresses safely through our change management systems.
For users with a default or non-custom quota set, our telemetry indicates that users are continuing to see relief.
We understand how impacting this issue has on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Wednesday, September 1, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with non-custom quotas may see a delay in mitigation, and if necessary, they can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: The deployment continues to progress and users with custom quotas will experience relief as the fix saturates.
As part of our overall mitigation strategy, we intend to trigger an automatic refresh of all affected OneDrive for Business clients; however, users with non-custom quotas can manually trigger a refresh through various actions within OneDrive. For example, accessing OneDrive for Business account from the web or selecting a file.
We understand how impacting this issue has on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, September 2, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with non-custom quotas may see a delay in mitigation, and if necessary, they can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: The deployment is nearing completion, and we expect to begin post deployment validations by the end of day, September 2, 2021. Once the fix has taken full effect, both users with custom and non-custom quotas can manually trigger a refresh through various actions within OneDrive to resolve this issue. For example, by accessing their OneDrive for Business account from the web or selecting a file.
Our automatic refresh activity is on schedule to be completed and initiated by end of day, September 3, 2021.
We understand how impacting this issue has on your organization and we want to assure you that we are treating the issue with the utmost priority. We appreciate your patience and will continue to update the Service Health Dashboard daily.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Friday, September 3, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with non-custom quotas may see a delay in mitigation, and if necessary, they can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: Our telemetry indicates that the fix is functioning as expected post deployment; however, we identified a subset of infrastructure that is taking longer than expected to update. We’ll continue to monitor the status of the deployment to ensure it completes successfully.
Our automatic refresh activity has been initiated and will take effect over the following days.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Sunday, September 5, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with non-custom quotas may see a delay in mitigation, and if necessary, they can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: We successfully initiated the manual refresh activity and have validated that approximately 20 percent of the remaining non-custom accounts have been addressed.
In parallel, we're continuing to deploy the fix that will address the custom quota impact. Once complete, we'll initiate a manual refresh for the accounts with the custom quotas.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Monday, September 6, 2021, at 11:00 PM UTC

More info: For any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with non-custom quotas may see a delay in mitigation, and if necessary, they can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: We continue to perform the manual refresh activity, and approximately 40 percent of the remaining non-custom accounts have been completed.
Additionally, the fix that will address the custom quota impact continues deployment and has already been deployed to the majority of the service. We’ve activated the fix on 50 percent of the infrastructure that the fix has been deployed to, and expect the fix to be activated on 100 percent of the components within the next six hours.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Tuesday, September 7, 2021, at 11:00 PM UTC

More info: While the vast majority of impact associated with this event has been addressed, we remain committed to offering potential workarounds to those users who may still be affected.
For users that remain impacted, any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with custom and non-custom quotas may see a delay in mitigation, and if necessary, they can expedite this process by navigating to their OneDrive for Business account via the web.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: The fix has been activated on 100 percent of the affected components. At this time, users with non-custom and custom quotas can manually trigger a refresh through various actions within OneDrive to remediate any lingering impact. For example, accessing a OneDrive for Business account from the web or selecting a file within OneDrive will trigger such a refresh. Additionally, we are entering an extended period of monitoring to ensure that users continue to experience resolution.
We’re continuing to complete refresh activities designed to automatically trigger a refresh without manual intervention.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Wednesday, September 8, 2021, at 11:00 PM UTC

More info: While the vast majority of impact associated with this event has been addressed, we remain committed to offering potential workarounds to those users who may still be affected.
For users that remain impacted, any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with custom and non-custom quotas may see a delay in mitigation. As such, all users can manually trigger a refresh through various actions within OneDrive to remediate any lingering impact. For example, accessing a OneDrive for Business account from the web or selecting a file within OneDrive will trigger such a refresh.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: Our telemetry data indicates that this issue has been resolved for the majority of users, and the subset of users still impacted are continuing to experience incremental relief. We’ll continue to monitor as we complete our refresh activities designed to resolve this issue without manual intervention on the part of individual users.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Thursday, September 9, 2021, at 11:00 PM UTC

More info: While the vast majority of impact associated with this event has been addressed, we remain committed to offering potential workarounds to those users who may still be affected.
For users that remain impacted, any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with custom and non-custom quotas may see a delay in mitigation. As such, all users can manually trigger a refresh through various actions within OneDrive to remediate any lingering impact. For example, accessing a OneDrive for Business account from the web or selecting a file within OneDrive will trigger such a refresh.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: We expect the remaining impacted users to become fully resolved within the next 48-hours. We’ll continue to monitor progress towards full remediation for the isolated subset of users who are continuing to experience incremental relief.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Start time: Wednesday, August 25, 2021, at 2:31 AM UTC
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Friday, September 10, 2021, at 11:00 PM UTC

More info: While the vast majority of impact associated with this event has been addressed, we remain committed to offering potential workarounds to those users who may still be affected.
For users that remain impacted, any quota which exceeds the 1TB storage, users may only be able to see their content in read-only mode.
Whilst in read-only mode, users can access their content in OneDrive for Business, but are unable to make changes.
For users experiencing impact with custom quotas, we have provided an interim solution below while we work on developing a more robust solution. This solution was provided in an earlier communication and was not functioning properly, however, we have since addressed the issue.
We recommend admins attempt to manually set the quota for individual users. Instructions can be found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
We're expecting some users with custom and non-custom quotas may see a delay in mitigation. As such, all users can manually trigger a refresh through various actions within OneDrive to remediate any lingering impact. For example, accessing a OneDrive for Business account from the web or selecting a file within OneDrive will trigger such a refresh.
While we understand this may not be a viable option for all organizations, we're committed to providing all potential solutions to our customers.
Current status: We expect the remaining impacted users to become fully resolved within the next 48-hours. We’ll continue to monitor progress towards full remediation for the isolated subset of users who are continuing to experience incremental relief.
We understand how impacting this issue has been on your organization and we want to assure you that we are treating the issue with the utmost priority.
Scope of impact: This issue affects a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Start time: Wednesday, August 25, 2021, at 2:31 AM UTC
Preliminary root cause: A misconfiguration resulted in our internal systems not recognizing user licenses and reverting the storage quota limit to the default settings of 1TB.
Next update by: Friday, September 10, 2021, at 11:00 PM UTC

Whilst in read-only mode, users were able to access their content in OneDrive for Business, but were unable to make changes.
Instructions to manually set quotas could have been found here: https://docs.microsoft.com/en-us/onedrive/change-user-storage
Final status: We've completed our mitigation efforts and confirmed that the issue has been successfully resolved. We appreciate your patience during the duration of this incident.
Scope of impact: This issue affected a large subset of users worldwide, who have a storage quota that exceeds 1TB.
Start time: Wednesday, August 25, 2021, at 2:31 AM UTC
End time: Friday, September 10, 2021, at 4:30 AM UTC
Root Cause: As part of feature improvements intended to address inefficient logic managing OneDrive for Business quotas, a code change was introduced. On August 25, 2021 a previously unidentified exception occurred which correlated with the recent change. This exception gave the impression that a user had no licenses assigned. The quota management component would then automatically assign a 1TB quota limit, which is the default value if a user had no explicit license enabled. This unexpected change then caused impact as many organizations set larger quote limits by default, or give specific users larger limits than the standard 1TB.
Next steps: - For a more comprehensive list of next steps and actions, please refer to the Post Incident Review document.
A post-incident report has been published

A post-incident report has been published.

Title: Some admins are unable to change OneDrive for Business user storage limits
User Impact: Admins are unable to change OneDrive for Business user storage limits.
Current status: We're investigating a potential issue where admins are unable to change OneDrive for Business user storage limits. We'll provide an update within 30 minutes.

Current status: We’re reviewing details provided in the support case to determine the next steps needed to resolve this issue.
Scope of impact: Impact is specific to admins who are served through the affected Asia-Pacific infrastructure.
Next update by: Wednesday, August 25, 2021, at 12:30 PM UTC

Current status: We're analyzing Unified Logging Service (ULS) logs to isolate the source of the issue and develop a mitigation plan.
Scope of impact: Impact is specific to admins who are served through the affected Asia-Pacific infrastructure.
Next update by: Wednesday, August 25, 2021, at 2:30 PM UTC

Current status: We're continuing to analyze Unified Logging Service (ULS) logs from our reproduction of the issue, to determine our next troubleshooting steps.
Scope of impact: Impact is specific to admins who are served through the affected infrastructure.
Next update by: Wednesday, August 25, 2021, at 6:00 PM UTC

Current status: Our analysis of the ULS data from our reproduction of the issue is ongoing. In parallel, we're reviewing recent service changes to further our efforts to isolate the source of the problem.
Scope of impact: Impact is specific to admins who attempt to change OneDrive for Business user storage limits.
Next update by: Wednesday, August 25, 2021, at 9:30 PM UTC

Final status: Following our ULS data analysis, we've identified a recent service update that was preventing admins from changing OneDrive for Business user storage limits. We've reverted the recent update, and confirmed via internal telemetry that it has successfully remediated impact.
Scope of impact: Impact was specific to admins who were attempting to change OneDrive for Business user storage limits.
Start time: Friday, August 13, 2021, at 1:22 AM UTC
End time: Wednesday, August 25, 2021, at 8:07 PM UTC
Root cause: A recent service update designed to redistribute load within the SharePoint Online Directory resulted in impact.
Next steps: - We're reviewing our update procedures to better understand why the change produced impact and to identify similar issues during our development and testing cycles.
This is the final update for the event.