Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may be unable to initiate screen sharing in 1:1 calls using the Microsoft Teams web client – ONGOING

Announcements Arpan Das

21/04/2026 08:33:00 AM

NHSmail Reference: INC46804402

Microsoft Reference: TM1286033

Issue Status: ONGOING

Issue Description: Users may be unable to initiate screen sharing in 1:1 calls using the Microsoft Teams web client.

More info: Specifically, only the first screen sharing session works; subsequent screen-sharing attempts may not be visible.

While Microsoft are working to remediate this issue, affected users can still perform screen sharing by:

– Using the desktop or mobile apps
– Adding another user to the call
– Ending and restarting the call

Current Update: 28/05/2026 09:51:00 AM– Microsoft’s fix for Mac devices is fully deployed and available in Microsoft Teams web client version 26106.2113.4690.1073. Affected Mac users should update their Teams web client to this version to receive the fix and remediate impact. Their fix deployment for Windows devices, which will be available in Microsoft Teams web client version 26106.1911.4707.3286, is continuing to saturate throughout the affected environment. They expect this saturation to complete and remediate the remaining impact by their next scheduled update.

Scope of impact: Any user initiating a second screen sharing session within a 1:1 call using the Microsoft Teams web client may be affected.

Next update by: Wednesday, May 27, 2026, at 9:30 PM UTC