TM1180557: Microsoft Teams Service Health Incident (Service Restored)

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Oct 27, 2025, 9:47:43 AM (12 days ago) Oct 27
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Some users may have been unable hear text-to-speech during auto-attendant calls in Microsoft Teams.                                                                                                                                                                                                         
Microsoft

Some users may have been unable hear text-to-speech during auto-attendant calls in Microsoft Teams

ID: TM1180557

Issue type: Incident

Status

Service Restored

Impacted services

Microsoft Teams

Details

Title: Some users may have been unable hear text-to-speech during auto-attendant calls in Microsoft Teams

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

Final status: We've 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.

Start time: Saturday, October 25, 2025, at 4:15 AM UTC

End time: Monday, October 27, 2025, at 12:22 PM UTC

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:

- We're investigating why the change caused the English (United Kingdom) language to become unavailable within the backend Speech service.

We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.

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