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

16/04/2026 8:45:00 AM

NHSmail Reference: INC46803063

Microsoft Reference: TM1283300

Issue Status: ONGOING

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.

Current Update: 22/04/2026 08:40:00 AM–  Microsoft are monitoring service health telemetry which continues to show a positive trend towards recovery for Mac users. They anticipate the service will have fully recovered for all affected users by their next scheduled communications 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.

Next update by: Wednesday, April 22, 2026, at 8:00 PM UTC