Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users get an error that can be bypassed when launching that Microsoft Teams desktop and web apps – ONGOING

Announcements Arpan Das

08/08/2025 08:29:00 AM

NHSmail Reference: INC46600582

Microsoft Reference: TM1131505

Issue Status: ONGOING

Issue Description: Users get an error that can be bypassed when launching that Microsoft Teams desktop and web apps.

More info: Affected users see an error that they couldn’t connect to this app.” when launching the Microsoft Teams desktop and web app. Users can bypass this error message and launch the app by clicking the “Activity” or “Chat” buttons on the left side of the screen.

Current Update: 14/08/2025 08:39:00 AM – Microsoft have initiated the deployment to enable the fix for all affected users, and they are monitoring its progress. They will provide a resolution timeline once it’s available.

Scope of impact: Your organization is impacted by this event, and the problem impacts users launching the Microsoft Teams desktop and web apps.

Root cause: A recent change, intended to improve the left sidebar in Microsoft Teams, enabled an unoptimized code flow that’s causing an error to be generated when launching that Microsoft Teams desktop and web app.

Next update by: Monday, August 18, 2025, at 6:30 PM UTC