Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may have degraded video and screensharing quality in Microsoft Teams – RESOLVED

15/01/2026 08:36:00 AM

NHSmail Reference: INC46724473

Microsoft Reference: TM1216503

Issue Status: RESOLVED

Issue Description: Users may have degraded video and screensharing quality in Microsoft Teams.

More info: The issue isn’t limited to Microsoft Teams Rooms (MTR) devices but also affects desktop clients and other scenarios.

Final Update: 19/01/2026 08:45:00 AM – After extensive monitoring, Microsoft have confirmed that the configuration change was successful and the impact is remediated.

Scope of impact: This issue could affect users joining Microsoft Teams meetings whose requests are routed through portions of Microsoft Teams infrastructure that have received the update. This information may be updated as their investigation continues.

Root cause: A recent Microsoft Teams server update unintentionally introduced a corruption scenario, leading to degraded video or screensharing quality during calls.

Next Steps: Microsoft are further reviewing the offending server update to understand how the corruption scenario was introduced, and to understand what prevented it from being detected in our update testing and validation procedures, which will allow us to prevent similar issues in future updates.