Cloud Issues - Windows 11 Update Disrupts Teams and OneDrive

What Happened

On March 10, 2026, Microsoft released a cumulative update for Windows 11, identified as KB5079473. Shortly after its deployment, users began reporting issues with signing into several Microsoft applications, including Microsoft Teams Free and OneDrive. The problem stems from a bug that misidentifies a user's internet connectivity state, displaying an error message that suggests they are offline when they are not.

Microsoft acknowledged the issue on March 19, 2026, confirming that the bug affects personal Microsoft accounts. This means that users who rely on these services for personal or small business use are currently locked out of their accounts despite having active internet connections.

Who's Affected

The bug impacts a wide range of Microsoft applications that require account sign-ins, such as Microsoft Edge, Excel, Word, and Microsoft 365 Copilot. However, it does not affect organizations using Entra ID (formerly Azure Active Directory) for enterprise authentication. Therefore, businesses using organizational credentials can continue their operations without interruption.

The affected platforms include Windows 11 versions 25H2 and 24H2, while no server-side platforms appear to be impacted at this time. This situation is particularly troublesome for individual users and small businesses that depend on Microsoft’s free-tier services, as they face significant disruptions in their daily activities.

What Data Was Exposed

While the bug itself does not lead to data exposure, it does create a frustrating scenario for users who are unable to access their files and communications. The inability to sign into applications means that users cannot sync files on OneDrive or communicate via Teams, which are essential tools for many personal and small business operations.

Microsoft has opened an official tracking page for the issue and is actively investigating the root cause. They have assured users that a fix is expected soon, but until then, many are left without access to critical services.

What You Should Do

In the meantime, Microsoft has provided a temporary workaround for affected users. Restarting the device while ensuring an active internet connection can reset the problematic network state and may resolve the sign-in failures. However, users must be cautious; restarting without an internet connection may cause the issue to reoccur.

As Microsoft works on a permanent solution, users are encouraged to monitor the Windows release health dashboard for updates. This situation serves as a reminder of the importance of maintaining reliable access to cloud services and the potential disruptions that can arise from routine updates.