Microsoft has released an emergency update to address a major issue that breaks sign-ins with Microsoft accounts across multiple Microsoft apps, including Teams and OneDrive.

This issue appears after installing the KB5079473 cumulative update that Microsoft released as part of this month's Patch Tuesday, and it warns users that the affected devices are not connected to the Internet.

The list of affected apps also includes Microsoft Edge, Microsoft 365 Copilot, and Office apps such as Excel and Word, which display the same error message for features that require a Microsoft account sign-in.

"As a result of this issue, sign in attempts will display an error message with text similar to 'You'll need the Internet for this. It doesn't look like you're connected to the Internet.' This appears even if the device is connected to the Internet," Microsoft said when it acknowledged the bug on Friday.

"Please note that this issue occurs only with sign in operations involving Microsoft accounts, which are commonly used for Microsoft Teams Free. Businesses using Entra ID (previously known as Azure Active Directory) for app authentication will not be affected by this issue."

While working on a fix, Microsoft also provided a temporary workaround for affected users that requires them to restart their PCs in the hope that the internet connectivity issues will resolve on their own.

Over the weekend, Microsoft started rolling out the KB5085516 optional out-of-band update, which addresses this bug and includes all patches delivered with the Microsoft 2025 Patch Tuesday Windows security update.

"This issue was resolved by Windows updates released March 21, 2026 (), and later updates. We recommend you install the latest updates for your device as they contain important improvements and issue resolutions, including this one," Microsoft said in a Saturday center update on the Windows release health dashboard.

"This OOB update is available for Windows 11, versions 25H2 and 24H2 devices that receive standard Windows updates. It can be installed through Windows Update or the Microsoft Update Catalog."

Since this month's Patch Tuesday updates were released, Microsoft has issued two additional emergency updates for hotpatch-enabled Windows 11 Enterprise devices to address a Bluetooth device visibility issue and security vulnerabilities in the Routing and Remote Access Service (RRAS) management tool.

It also shared guidance for fixing C:\ drive access issues on some Samsung Windows 11 laptops, which were triggered by a buggy version of the Samsung Galaxy Connect (or Samsung Continuity Service) app.