Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may have experienced delays in receiving notifications and placing or receiving calls in Microsoft Teams – RESOLVED

Announcements Arpan Das

09/04/2026 09:07:00 AM

NHSmail Reference: INC46794669

Microsoft Reference: TM1275028

Issue Status: RESOLVED

Issue Description: Users may have experienced delays in receiving notifications and placing or receiving calls in Microsoft Teams.

Current Update: 10/04/2026 09:36:00 AM–Microsoft has identified that a temporary spike in traffic to a backend registration service caused service instability. Once the temporary traffic increase subsided, the service recovered automatically without requiring manual intervention. Following a period of monitoring service telemetry, they have confirmed that impact has been fully remediated.

Scope of impact: Impact was specific to some users expecting to receive notifications or attempting to place or receive calls in Microsoft Teams.

Root cause: A temporary spike in traffic to a backend registration service caused service instability.

Next Steps: Microsoft are reviewing safeguards to help prevent similar traffic spikes from impacting the service in the future.