Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users are unable to join some Microsoft Teams meetings through the “Join” button in the meeting chat – ONGOING

12/02/2026 08:43:00 AM

NHSmail Reference: INC46748302

Microsoft Reference: TM1231009

Issue Status: ONGOING

Issue Description: Users are unable to join some Microsoft Teams meetings through the “Join” button in the meeting chat

More info: While Microsoft are focused on remediation, users may be able to join meetings through meeting URLs.

Current Update: 18/02/2026 08:42:00 AM – : Microsoft has confirmed that our fix has completed deployment to all affected environments. They are in the process of validating that this fix has successfully relieved impact for users.

Scope of impact: This issue may potentially impact any user attempting to join affected meetings through the “Join” button in the meeting chat. This information may be updated as our investigation continues.

Root cause: A recent update to the services that handle Teams meeting titles contains an error that is improperly handling the URLs, resulting in impact

Next update by: Friday, February 18, 2026, at 11:00 AM UTC