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Cyber Security
Independent · Digital
Thehackingpost
CybersecurityAI-assisted

Windows 11 March Update Breaks Microsoft Teams and OneDrive Sign-Ins

Image: Windows 11 March Update Causes Issues with Microsoft Teams

Image: Windows 11 March Update Causes Issues with Microsoft Teams

Microsoft has identified a bug in the March 2026 cumulative update for Windows 11 that affects user access to Microsoft Teams Free, OneDrive, and other applications. The issue, which is associated with the KB5079473 update released on March 10, 2026, prevents users from signing into their accounts, even with an active internet connection.

Update Version: KB5079473 (OS Build 26100.8037) Release Date: March 10, 2026 Issue Confirmation Date: March 19, 2026

Microsoft has confirmed that the issue stems from a specific network connectivity state that devices enter post-update. This results in a misleading error message indicating a lack of internet connection.

The following applications are impacted by this issue:

Microsoft Teams Free Microsoft OneDrive Microsoft Edge Microsoft Excel Microsoft Word Microsoft 365 Copilot

This results in a misleading error message indicating a lack of internet connection.
William Hayes · Thehackingpost

The issue primarily affects personal Microsoft accounts. Organizational users utilizing Entra ID (formerly Azure Active Directory) for authentication are not impacted.

Windows 11, version 25H2 Windows 11, version 24H2

No server-side platforms are currently affected by this bug.

Microsoft suggests a temporary solution while a permanent fix is developed. Users should restart their devices while ensuring an active internet connection during the restart process to resolve the sign-in issue. Failure to maintain an internet connection might cause the error to recur.

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The March 10 Patch Tuesday update, primarily a security and quality update, inadvertently introduced this issue. Microsoft has set up an official tracking page for updates on the resolution of this issue.

Separately, users of Samsung devices reported a complete loss of access to their C: drive following the February 2026 security update (KB5077181). The error message received was "C:\ is not accessible – Access denied" , leading to various application failures.

For enterprise IT administrators, issues have been reported with the installation of .msu files from shared network folders using the Windows Update Standalone Installer (WUSA). The process may return an ERROR_BAD_PATHNAME message if multiple update files are present.

Users are advised to follow Microsoft's Windows release health dashboard for the latest updates.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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