Outage in Microsoft 365
Users may be unable to join calls or meetings in Microsoft Teams for Mac
Resolved Minor
September 03, 2026 - Started 2 days ago
- Lasted about 20 hours
Incident Report
Summary AI Generated
Microsoft Teams for Mac users experienced an inability to join calls or meetings for approximately 9.9 hours. The issue was initially attributed to a problematic code change causing service infrastructure to fail processing some requests, though this was later ruled out as investigators reassessed the root cause by reviewing service logs. Remediation efforts were ongoing as engineers worked to isolate the source of impact and restore full call and meeting functionality.
Title: Users may be unable to join calls or meetings in Microsoft Teams for Mac
User impact: Users may be unable to join calls or meetings in Microsoft Teams for Mac.
Current status: We're investigating a potential issue with Microsoft Teams and checking for impact to your organization. We'll provide an update within 30 minutes.
User impact: Users may be unable to join calls or meetings in Microsoft Teams for Mac.
Current status: We're investigating a potential issue with Microsoft Teams and checking for impact to your organization. We'll provide an update within 30 minutes.
Components affected
Microsoft TeamsTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
2 days ago - at 09/03/2026 08:13PM
Title: Users may be unable to join calls or meetings in Microsoft Teams for Mac
User impact: Users may be unable to join calls or meetings in Microsoft Teams for Mac.
Current status: Further review of the suspected code change indicates it may not be the cause of impact for this event. We're reassessing our root cause understanding and reviewing service logs to isolate the source of impact, so that we can determine our next steps regarding impact remediation.
Scope of impact: Some users attempting to join calls or meetings in Microsoft Teams for Mac may be impacted. This section may be updated as our investigation continues.
Next update by: Friday, September 4, 2026, at 4:00 PM UTC
2 days ago - at 09/03/2026 07:25PM
Title: Users may be unable to join calls or meetings in Microsoft Teams for Mac
User impact: Users may be unable to join calls or meetings in Microsoft Teams for Mac.
Current status: We've identified a code change that's causing the service infrastructure responsible for call and meeting functionality to fail to process some requests, resulting in impact. We're assessing potential remediation actions to address the problematic code change and restore service functionality.
Scope of impact: Some users attempting to join calls or meetings in Microsoft Teams for Mac may be impacted. This section may be updated as our investigation continues.
Start time: Thursday, July 2, 2026, at 3:09 PM UTC
Root cause: A code change is causing the service infrastructure responsible for call and meeting functionality to fail to process some requests, resulting in impact.
Next update by: Thursday, September 3, 2026, at 9:30 PM UTC
2 days ago - at 09/03/2026 06:59PM
Title: Users may be unable to join calls or meetings in Microsoft Teams for Mac
User impact: Users may be unable to join calls or meetings in Microsoft Teams for Mac.
Current status: We're investigating a potential issue with Microsoft Teams and checking for impact to your organization. We'll provide an update within 30 minutes.
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