Overview
Microsoft has acknowledged a known issue (incident ID TM1466820) that is preventing some users from opening the Teams desktop client on Windows. The problem causes delays of up to two minutes or blocks the client entirely, disrupting productivity for affected users.
Current Impact
- Loading delays: Users experience slow startup or failure to load the Teams desktop client.
- Workarounds: Microsoft advises using Teams on the web or the mobile app until remediation is complete.
- Root cause analysis: Service logs and telemetry are being reviewed, with some affected users contacted directly for investigation.
Related Issues
Microsoft is also investigating a Mac‑specific problem (incident ID TM1466659) where users cannot join Teams calls or meetings.
- Initially attributed to a code change, but further review suggests another underlying cause.
- Microsoft is reassessing its root cause understanding and working on mitigation.
Historical Context
Teams has faced several service disruptions in recent months:
- April 2026: Blocked Teams Free users from chatting and calling.
- August 2026 Patch Tuesday: Caused crashes and launch failures for Teams and New Outlook.
- Exchange Online outage: Triggered “Server busy” errors and delayed external email flow earlier today.
Recommendations for Users
- Switch to Teams Web: Access via browser to bypass desktop client issues.
- Use Teams Mobile: Continue collaboration on iOS or Android.
- Monitor Service Health: Stay updated on incident TM1466820 and TM1466659.
- Communicate internally: Inform teams about workarounds to minimize disruption.
Expert in the Cloud Insight
This outage highlights the dependency organizations place on collaboration platforms. When desktop clients fail, fallback access via web or mobile becomes critical. The lesson is clear: resilience planning must include multi‑platform access strategies, ensuring business continuity even during client‑specific outages.
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