Microsoft 365 Alert – Service Degradation – Microsoft 365 apps – Users may be unable to install Microsoft 365 desktop apps on Windows devices– RESOLVED

Announcements Arpan Das

17/11/2025 08:59:00 AM

NHSmail Reference: INC46682990

Microsoft Reference: OP1186186

Issue Status: RESOLVED

Issue Description: Users may be unable to install Microsoft 365 desktop apps on Windows devices

More info: This only impacts users who attempt to install version 2508 (Build 19127.20358) and version 2507 (Build 19029.20294) of the Microsoft 365 desktop apps.

Final Update: 19/11/2025 09:04:00 AM – Microsoft have confirmed that the fixed build is fully deployed and available and they have 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 be impacted.

Root cause: A newly released set of authentication components contain a misconfiguration that prevents users from installing Microsoft 365 desktop apps on Windows devices.

Next Steps: Microsoft are reviewing their validation and updating procedures to better detect and prevent issues like this prior to deployment in the future.