User Impact: Mac users may have been unable to sign into or run multiple OneDrive accounts on a single device.
More info: This problem mostly affected users attempting to sign into both a personal account and a business account on the same device, but also impacted users signing into two business accounts. The issue only impacted users who have updated their devices to macOS 11.6. The issue also impacted 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 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.
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
Source: Microsoft health Notification