Windows 11 Update Triggers Personal Account Sign-In Failures

Microsoft acknowledged on March 19, 2026, that a recent Windows 11 update has caused widespread sign-in failures for users attempting to access various company applications, affecting personal accounts on devices running the operating system.

The issue stems from the KB5079473 cumulative update, released on March 10 as part of Microsoft's monthly Patch Tuesday security and quality improvements. This update, applicable to Windows 11 versions 24H2 and 25H2, has led to erroneous error messages for a subset of users. When trying to log in with a Microsoft account, affected individuals see a prompt stating, "You'll need the Internet for this. It doesn't look like you're connected to the Internet," even though their devices maintain active internet connections. In some instances, users encounter error code 0x800704cf alongside the message.

Microsoft confirmed the problem affects any application feature requiring Microsoft account authentication. Prominently impacted services include Microsoft Teams Free, OneDrive for file synchronization, and Microsoft Edge browser. Other applications reporting disruptions are Microsoft Excel, Word, Microsoft 365 Copilot, the Xbox app, and the...