Some users may have been unable hear text-to-speech during auto-attendant calls in Microsoft Teams
ID: TM1180557
Issue type: Incident
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Impacted services
Microsoft Teams
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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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