Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may be unable to launch the Microsoft Teams desktop client – RESOLVED

Announcements Shagufta Naaz

16/04/2026 8:45:00 AM

NHSmail Reference: INC46803063

Microsoft Reference: TM1283300

Issue Status: RESOLVED

Issue Description: Users may be unable to launch the Microsoft Teams desktop client.

More info: When attempting to launch the Microsoft Teams desktop client, users are stuck on the loading screen and receive an error message “We’re having trouble loading your message. Try refreshing.”

Impacted users should restart their client to bypass impact.

Now that the update that introduced the regression has been fully reverted, a restart will be needed in which users fully quit and then restart Teams so that our solution propagates.

Final Update: 23/04/2026 02:43:00 PM– Microsoft’s monitoring has verified that Window users continue to be no longer impacted by this event; however, Mac users may still intermittently be prevented from launching the Teams desktop client. They are expecting their mitigations will have completed and for impact to be remediated by their next scheduled communication update.

Scope of impact: Users attempting to launch the Microsoft Teams desktop client may be impacted by this event. This section may be updated as our investigation continues.

Root cause: A recent service update introduced a regression within the Microsoft Teams client build caching system and is resulting in impact.