Outage in Microsoft 365 Consumer
Users may intermittently be unable to join meetings or access Microsoft Teams Free for Windows
Resolved Major
March 18, 2026 - Started 22 days ago
- Lasted 2 days
Incident Report
Summary AI Generated
A recent Windows update introduced a regression that caused Microsoft Teams Free users on Windows to intermittently be unable to join meetings or access the service, with users seeing authentication error messages stating "We couldn't authenticate you" due to device, network, or technical issues. The incident affected multiple Windows versions (25H2, 24H2, 23H2, and 22H2) and lasted 47.3 hours while Microsoft developed a fix to address the regression. Users could temporarily resolve the issue by restarting their computers as a workaround during the incident.
We're continuing to develop our fix aimed at addressing the regression introduced by the offending Windows update after we confirmed that a configuration change isn't a viable option in addressing impact.
Components affected
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Latest Updates ( sorted recent to last )
21 days ago - at 03/19/2026 05:41PM
Title: Users may intermittently be unable to join meetings or access Microsoft Teams Free for Windows
User impact: Users may intermittently be unable to join meetings or access Teams Free for Windows.
More info: Users may see the following banner: "We couldn't authenticate you, This could be due to a device or network problem, or Teams could be experiencing a Technical issue."
This impacts Windows' versions 25H2: 26200.8037, 24H2: 26100.8037, 23H2: 22631.6783, 22H2: 19045.7058, and users can restart their computer to circumvent impact.
Current status: We're continuing to develop our fix aimed at addressing the regression introduced by the offending Windows update after we confirmed that a configuration change isn't a viable option in addressing impact.
Start time: Tuesday, March 10, 2026, at 12:00 AM UTC
Root cause: A recent Windows update introduced a regression within the Microsoft Teams Free for Windows service, and is resulting in impact.
Next update by: Friday, March 20, 2026, at 6:30 PM UTC
21 days ago - at 03/18/2026 08:29PM
Title: Users may intermittently be unable to join meetings or access Microsoft Teams Free for Windows
User impact: Users may intermittently be unable to join meetings or access Teams Free for Windows.
More info: Users may see the following banner: "We couldn't authenticate you, This could be due to a device or network problem, or Teams could be experiencing a Technical issue."
This impacts Windows' versions 25H2: 26200.8037, 24H2: 26100.8037, 23H2: 22631.6783, 22H2: 19045.7058, and users can restart their computer to circumvent impact.
Current status: We're developing a fix to address the regression that’s occurring as a result of a recent Windows update, which we expected to will be completed by March 24, 2026. In parallel, we're evaluating the viability of a configuration change to address this impact expediently.
Next update by: Thursday, March 19, 2026, at 6:30 PM UTC
22 days ago - at 03/18/2026 07:06PM
Title: Users may intermittently be unable to join meetings or access Microsoft Teams Free for Windows
User impact: Users may intermittently be unable to join meetings or access Teams Free for Windows.
More info: Users may see the following banner: "We couldn't authenticate you, This could be due to a device or network problem, or Teams could be experiencing a Technical issue."
This impacts Windows' versions 25H2: 26200.8037, 24H2: 26100.8037, 23H2: 22631.6783, 22H2: 19045.7058, and users can restart their computer to circumvent impact.
Current status: We determined that a recent Windows update contains a regression that’s resulting in impact. We're investigating routes to address this impact expediently but recommend that users restart their computer to circumvent this impact in the meantime.
Next update by: Wednesday, March 18, 2026, at 8:30 PM UTC
22 days ago - at 03/18/2026 06:39PM
Title: Users may intermittently be unable to join meetings or access Microsoft Teams Free for Windows
User impact: Users may intermittently be unable to join meetings or access Teams Free for Windows.
More info: Users may see the following banner: "We couldn't authenticate you, This could be due to a device or network problem, or Teams could be experiencing a Technical issue."
This impacts Windows' versions 25H2: 26200.8037, 24H2: 26100.8037, 23H2: 22631.6783, 22H2: 19045.7058, and users can restart their computer to circumvent impact.
Current status: We're investigating a potential issue with Teams Free and checking into impact to users. We'll provide an update within 30 minutes.
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