Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may be unable to view the combined chat and channel view in the User Interface (UI) – RESOLVED

22/08/2025 08:45:00 AM

NHSmail Reference: INC46610624

Microsoft Reference: TM1139221

Issue Status: RESOLVED

Issue Description: Users may be unable to view the combined chat and channel view in the User Interface (UI).

More info:  When a user attempts to change to the combined chat and channel view, they may still see the previous view they selected. Some users report that as a result of this impact, they can”t access Teams channels due to the icon not being present in the left panel.

The issue primarily affects the Microsoft Teams desktop client; users that have access to the Microsoft Teams web client can use this to bypass the impact. Additionally, users can temporarily work around the issue by using one of the following methods:

– Restart the client, and then make a change to any setting (for example, toggling “Show time stamps” from Off to On) located on the Chats and Channel settings page, and then reverting that setting. The change can be reverted immediately without impacting the workaround.

– Clear the client cache.

Final Update: 29/08/2025 08:50:00 AM – Microsoft’s have completed deploying the code fix and validated with internal telemetry that the issue is resolved.

Scope of impact: This issue may impact any user attempting to view the combined chat and channel view in Microsoft Teams.

Root cause: A recent standard update to the components of the Microsoft Teams service responsible for facilitating the combined chat and channel view introduced an error that’s resulting in impact.

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