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: 21/04/2026 08:33:00 AM– Microsoft are in the process of analyzing gathered logs and service telemetry to better understand the impact scenario and develop a remediation strategy.

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: Tuesday, April 21, 2026, at 5:00 PM UTC