Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may not see chat messages from new contacts in the Microsoft Teams desktop client until a restart occurs – RESOLVED

Announcements Sharmista Mohanta

29/06/2026 10:04:00 AM

NHSmail Reference: INC46863322

Microsoft Reference: TM1403917

Issue Status: RESOLVED

Issue Description: Users may not have seen chat messages from new contacts in the Microsoft Teams desktop client until a restart occurred.

More info: Feedback from affected users and internal testing indicated the impact may have been specific to the combined chat and channel view in the Microsoft Teams desktop client. Impacted users may have been able to avoid impact by utilizing the desktop client’s separated chat and channel view experience.

Final Update: 29/06/2026 10:06:00 AM – Microsoft has identified some missing local settings in the Microsoft Teams desktop client and a feature that allows users to move chats to a new section was relying on these missing settings, causing impact. While they continue to investigate the reason, the local settings were going missing so they can develop a long-term code fix, they disabled the offending feature and confirmed that impact is remediated.

Scope of impact: Some users that were recipients of messages from new contacts in the Microsoft Teams desktop client may have been impacted.

Root cause: Some missing local settings in the Microsoft Teams desktop client and a feature that allowed users to move chats to a new section was relying on these missing settings caused impact.

Next Steps: Microsoft is continuing to investigate the reason the local settings are going missing, so they can develop a long-term code fix.