Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be unable to access the My Templates add-in in Outlook – NEW

Announcements Arpan Das

23/03/2026 11:58:00 AM

NHSmail Reference: INC46779675

Microsoft Reference: EX1255397

Issue Status: OPEN

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

More info: This issue impacts both the Outlook desktop client and Outlook on the web. Some affected users find that the “My Templates” icon is missing from the Outlook ribbon and others may be unable to find templates in the AppData Microsoft Templates location, even though templates are known to exist and may still be being used by other (non-impacted) users.

Current Update: 23/03/2026 11:58:00 AM – Microsoft are continuing to analyze system logs and service data to isolate a potential root cause and determine next steps for mitigation.

Scope of impact: Some users attempting to access or use the My Templates add-in within Outlook may be impacted. This information may be updated as our investigation continues.

Next update by: Monday, March 23, 2026, at 7:00 PM UTC