Windows 11 March Update Causes Microsoft Teams, OneDrive Sign-in Issues

Key Takeaways

• Microsoft’s March 2026 cumulative update (KB5079473) for Windows 11 is causing sign-in failures for various applications.
• The issue primarily impacts personal Microsoft accounts, locking users out of services like Teams Free, OneDrive, Edge, and Microsoft 365 apps.
• Affected platforms include Windows 11 versions 25H2 and 24H2.
• A temporary workaround involves restarting the device while ensuring a continuous internet connection.
• Microsoft has acknowledged the bug and is actively developing a permanent fix, expected soon.

Microsoft has confirmed a significant defect within its recent March 2026 cumulative update, KB5079473, which is preventing some Windows 11 users from accessing various Microsoft applications. The update, released on March 10, 2026, has led to widespread sign-in problems for users attempting to log into services such as Microsoft Teams Free and OneDrive, even when their devices are fully connected to the internet.

Following the installation of update KB5079473, identified as OS Build 26100.8037, a segment of Windows 11 users began encountering authentication failures for applications that rely on personal Microsoft accounts. Users are met with a misleading error message stating, “You’ll need the Internet for this. It doesn’t look like you’re connected to the Internet,” despite their network connections functioning correctly.

Microsoft officially acknowledged the problem on March 19, 2026, approximately a week after the update’s deployment. The company attributes the issue to a specific network connectivity state that devices enter post-update. A permanent resolution is currently in development and is anticipated to be released within the next few days.

Affected Applications and Platforms

The sign-in malfunction extends beyond just Teams Free and OneDrive. Microsoft has verified that the bug impacts any application feature requiring a personal Microsoft account for authentication. This includes a range of popular services:

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

It is crucial to note that this issue exclusively affects personal Microsoft accounts. Organizational accounts utilizing Entra ID (formerly Azure Active Directory) for enterprise authentication remain unaffected. Consequently, most business and enterprise environments leveraging Microsoft 365 with organizational credentials should continue to operate without disruption.

The problem has been confirmed on the following client operating system versions:

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

No server-side platforms are currently impacted by this particular bug.

Temporary Workaround

While Microsoft engineers work on a definitive patch, the company has offered a temporary solution. Users experiencing sign-in issues are advised to restart their device while ensuring it maintains an active internet connection. This action is designed to reset the problematic network connectivity state, typically resolving the authentication failures.

However, users must heed an important warning: restarting the device without an active internet connection may cause it to revert to the faulty state, leading to the recurrence of the sign-in error. Therefore, it is imperative that devices remain connected to the internet before and throughout the restart process to prevent re-triggering the issue.

This bug is particularly disruptive for individual users and small businesses that depend on Microsoft’s free-tier services. Microsoft Teams Free, a crucial communication tool for personal use and smaller organizations not subscribed to Microsoft 365, is among the most significantly affected applications. For users relying on OneDrive for file synchronization or Teams Free for communication, this authentication barrier effectively renders these essential tools unusable until a fix is deployed.

The KB5079473 update, part of the March 10 Patch Tuesday releases, was primarily intended to deliver security enhancements and quality improvements, making this regression an unforeseen consequence of routine system maintenance. Microsoft has established an official tracking page for the issue, confirming active investigation and an impending resolution.

In related news, Microsoft also addressed reports from Samsung device users who experienced a complete loss of access to their C: drive following the February 2026 security update (KB5077181). This issue manifested as an “C: is not accessible – Access denied” error, leading to failures across various applications including Outlook, Office suites, web browsers, and system utilities. In severe instances, users were unable to elevate privileges or uninstall problematic updates.

Separately, enterprise IT administrators deploying Windows updates via the Windows Update Standalone Installer (WUSA) may encounter installation failures when attempting to install .msu files from a shared network folder containing multiple update files. This process returns an ERROR_BAD_PATHNAME message. This issue does not occur when only a single .msu file is present in the shared folder or when installations are performed directly from a local drive.

Users are advised to regularly consult Microsoft’s Windows release health dashboard for the most up-to-date information regarding these and other known issues.

What You Should Do

• If experiencing sign-in issues with Microsoft applications, perform a device restart.
• Crucially, ensure your device maintains a continuous and active internet connection before and during the entire restart process.
• Monitor Microsoft’s official Windows release health dashboard for updates on the permanent fix.
• Avoid restarting without an internet connection if you are experiencing the sign-in bug, as this may re-trigger the issue.

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