Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be unable to access the My Templates and Viva Insights add-ins in Exchange Online – RESOLVED

Announcements Arpan Das

10/11/2025 09:38:00 AM

NHSmail Reference: INC46678913

Microsoft Reference: EX1183224

Issue Status: RESOLVED

Issue Description: Users may be unable to access the My Templates and Viva Insights Outlook add-ins in Exchange Online.

Final Update: 26/12/2025 08:46:00 PM – Microsoft have identified that a recent backend change caused add‑in management requests to fail, resulting in inconsistent cached data and add‑ins appearing unavailable for some users. They have rolled back the change and refreshed the affected cached data to restore normal add‑in availability, and confirmed with some impacted users that this has successfully remediated the issue.

Scope of impact: The problem impacts some users trying to access the My Templates and Viva Insights Outlook add-ins in Exchange Online. This section may be updated as our investigation progresses.

Next Steps: Microsoft are reviewing their update procedures to better identify similar issues during their development and testing cycles.