Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users’ Power Automate flow operations or actions may not perform as expected in Microsoft Teams – RESOLVED

Announcements Arpan Das

08/05/2026 16:51:00 PM

NHSmail Reference: INC46821425

Microsoft Reference: TM1303836

Issue Status: RESOLVED

Issue Description: Users may see incorrect characters in incoming Microsoft Teams call notifications when display names contain diacritics.

More info:Users may see incorrect or corrupted characters in incoming Microsoft Teams call notification banners when display names contain European diacritical characters (e.g. ä, é, ü), resulting in names appearing with placeholder symbols.

Final Update: 25/05/2026 05:49:00 PM – Microsoft has confirmed after a period of monitoring service telemetry that impact has been remediated.

Scope of impact: Impact is specific to some users receiving inbound Microsoft Teams calls notifications when display names contain diacritics.

Root cause: A prior fix addressing corrupted text appearing when character encoding fails in call titles has unintentionally corrupted valid UTF-8 special characters in display names, causing improper character rendering in inbound call notifications and resulting in impact.

Next Steps: Microsoft are reviewing their deployment and provisioning procedures to help prevent similar problems in the future.