Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to access the My Templates add-in in Exchange Online- ONGOING

Announcements Shagufta Naaz

11/03/2026 08:41:00 AM

NHSmail Reference: INC46770251

Microsoft Reference: EX1238375

Issue Status: ONGOING

Issue Description: Some users may be unable to access the My Templates add-in in Exchange Online.

More info: Users may be unable to access the My Templates and Viva Insights add-ins as they’re missing from the Outlook desktop client, Outlook mobile, and Outlook on the web.

Current Update: 11/03/2026 08:41:00 AM –Microsoft has expanded communications to all potentially affected users and have updated the “Title”, “User impact”, “More info” and “Scope of impact” to reflect this change. After completing an analysis of HAR logs, we’ve isolated a potential code mismatch in the recent authentication change which needs to be corrected to remediate impact. They have created a code change and are deploying it to a subset of service infrastructure to test for impact remediation prior to initiating further deployment.

Scope of impact: This incident may affect some users attempting to access the My Templates and Viva Insights add-ins through the Outlook desktop client, Outlook mobile, and Outlook on the web. This section may be updated as our investigation continues.

Root cause: A recent authentication change intended to improve the My Templates and Viva Insights add-in functionality is causing access issues.

Next update by: Wednesday, March 11, 2026, at 8:30 PM UTC