Users may have been unable to install Microsoft 365 desktop apps on Windows devices
ID: OP1186186
Issue type: Incident
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Impacted services
Microsoft 365 apps
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Details
Title: Users may have been unable to install Microsoft 365 desktop apps on Windows devices
User impact: Users may have been unable to install Microsoft 365 desktop apps on Windows devices.
More info: This only impacted users who attempted to install version 2508 (Build 19127.20358) and version 2507 (Build 19029.20294) of the Microsoft 365 desktop apps.
Final status: We’ve confirmed that the fixed build is fully deployed and available and we’ve determined that users are now able to install Microsoft 365 desktop apps on Windows devices as expected.
Scope of impact: Any user attempting to install Microsoft 365 desktop apps on Windows devices may have been impacted.
Start time: Tuesday, November 11, 2025, at 6:00 PM UTC
End time: Tuesday, November 18, 2025, at 9:00 PM UTC
Root cause: A newly released set of authentication components contained a misconfiguration that prevented users from installing Microsoft 365 desktop apps on Windows devices.
Next steps:
- We’re reviewing our validation and updating procedures to better detect and prevent issues like this prior to deployment in the future.
This is the final update for the event.
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