Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may be intermittently unable to browse apps in Microsoft Teams – RESOLVED

Announcements Shagufta Naaz

20/04/2026 8:50:00 AM

NHSmail Reference: INC46803096

Microsoft Reference: TM1283997

Issue Status: RESOLVED

Issue Description: Users are unable to communicate with external domains in Microsoft Teams.

More info: Affected users are able to manage their existing apps without issue.

Final Update: 30/04/2026 09:59:00 AM– Following the deployment of their fix, internal telemetry has validated that the affected portion of Microsoft Teams app store infrastructure has been addressed and that the impact has been remediated.

Scope of impact: This issue may intermittently impact some users attempting to browse apps in Microsoft Teams. This section may be updated as our investigation continues.

Root cause: A recent change intended to update a portion of the Microsoft Teams app store infrastructure is resulting in impact.

Next steps: Microsoft are further analyzing the offending recent change to help us improve our pre-deployment testing and validation processes.