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

Announcements Arpan Das

08/05/2026 16:51:00 PM

NHSmail Reference: INC46821425

Microsoft Reference: TM1303836

Issue Status: ONGOING

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.

Current Update: 13/05/2026 08:39:00 PM– Microsoft has confirmed that the fix deployment is proceeding as expected, with an estimated completion date of Thursday, 21 May 2026.

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 update by: Thursday, May 21, 2026, at 4:30 PM UTC