Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may have been unable hear text-to-speech during auto-attendant calls in Microsoft Teams – RESOLVED

Announcements Arpan Das

27/10/2025 08:42:00 AM

NHSmail Reference: INC46666699

Microsoft Reference: TM1180557

Issue Status: RESOLVED

Issue Description: Users may have been unable hear text-to-speech during auto-attendant calls in Microsoft Teams.

Final Update: 27/10/2025 17:16:00 PM – Microsoft have confirmed that the issue is resolved after reverting the impacting update.

Scope of impact: This issue affected a subset of organizations that were configured to use English (United Kingdom) as the language.

Root cause: A recent change caused a specific language (English (United Kingdom)) to become unavailable within a backend Speech service. The Speech service is leveraged by Microsoft Teams auto-attendant text-to-speech functionality.

Next Steps: Microsoft are investigating why the change caused the English (United Kingdom) language to become unavailable within the backend Speech service.