Some users may be unable to open the Microsoft Teams desktop client
ID: TM1178840
Issue type: Incident
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Impacted services
Microsoft Teams
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Details
Title: Some users may be unable to open the Microsoft Teams desktop client
User impact: Users may have been unable to open the Microsoft Teams desktop client.
More info: Users who had characters in their user profile path that couldn’t be expressed in the Application and Network Seamlessly Integrated (ANSI) code page may have been unable to open Microsoft Teams.
Final status: After an extended period of monitoring the affected portion of the environment following the deployment of our fix, we’ve confirmed that impact has been remediated.
Scope of impact: Some users who attempted to open the Microsoft Teams desktop client who had characters in their user profile path that couldn’t be expressed in the ANSI code page may have been impacted.
Start time: Tuesday, October 21, 2025, at 4:34 PM UTC
End time: Thursday, October 30, 2025, at 1:00 AM UTC
Root cause: A recently merged code change introduced a code issue, which resulted in impact.
Next steps: We'll review our code merging validation process to identify possible refinement in order to prevent similar instances of this issue in the future.
This is the final update for the event.
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