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Microsoft Teams Outage History

Every past Microsoft Teams outage tracked by IsDown, with detection times, duration, and resolution details.

There were 9 Microsoft Teams outages since October 2025. The 9 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Major March 18, 2026

March 2026: Users may intermittently be unable to join meetings or access Microsoft Teams Free for Windows

Detected Mar 18, 2026 2:53 PM EDT · Resolved Mar 20, 2026 2:12 PM EDT · Duration 2 days

A Windows update introduced a regression that caused Microsoft Teams Free users to intermittently be unable to join meetings or access the service, with users seeing authentication error messages stating "We couldn't authenticate you, This could be due to a device or network problem, or Teams could be experiencing a Technical issue." The issue affected multiple Windows versions (25H2, 24H2, 23H2, and 22H2) and lasted 47.3 hours. Microsoft developed a fix to address the regression after determining that configuration changes were not viable, while users could temporarily resolve the issue by restarting their computers.