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International Business Times
International Business Times
Technology
Daniel Lee

Microsoft Windows 11 Emergency Update: Windows 11 to Fix Microsoft Account Sign-In Issues

Microsoft Windows

Microsoft released an emergency out-of-band update for Windows 11 on March 21, 2026, to resolve widespread sign-in problems affecting Microsoft accounts in apps and services following the March 10 Patch Tuesday security release.

Microsoft Windows 11

The update, KB5085516 (OS Builds 26200.8039 for version 25H2 and 26100.8039 for version 24H2), is cumulative and includes all fixes from the original March security update along with the specific resolution for the authentication bug. It applies to all editions of Windows 11 versions 25H2 and 24H2 that receive standard Windows updates.

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