Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may have been unable to mention bots in Microsoft Teams – RESOLVED

Announcements Arpan Das

19/03/2026 09:11:00 AM

NHSmail Reference: INC46777245

Microsoft Reference: TM1255396

Issue Status: RESOLVED

Issue Description: Users may have been unable to mention bots in Microsoft Teams.

More info: Impacted bots included any bot in Microsoft Teams that had an authentication configuration defined on the bot, such as, but not limited to:

– Project Agent
– Frontline Attendee
– Mainline Attendee
– Chat Agent

Final Update: 19/03/2026 09:12:00 AM –Microsoft has confirmed after monitoring service health telemetry that impact was successfully remediated for users after completing their rollback of the affecting deployment.

Scope of impact: This issue may have impacted any user attempting to mention bots in Microsoft Teams.

Root cause: A recent deployment to a service which bots performance was dependent on caused an issue resulting in bots becoming unresponsive.

Next Steps: Microsoft are reviewing their testing and validation procedures to identify opportunities to improve impact detection and better prevent similar future occurrences.