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Microsoft issued an emergency fix for a Windows 11 sign-in bug causing false "no internet" errors, affecting Microsoft account access.
Microsoft released an emergency update, KB5085516, on March 21, 2026, to fix a widespread sign-in issue in Windows 11 that caused false "no internet" errors for Microsoft account users, disrupting access to apps like Teams, OneDrive, Office, and Edge.
The bug emerged after the March 10 security update and affected users despite stable internet connections.
The fix, available manually via Windows Update, resolves authentication failures and includes all prior patches.
Microsoft urged affected users to install it promptly, noting no confirmed exploitation but potential risks.
The update follows a series of recent emergency fixes for stability issues, raising concerns about update reliability amid ongoing AI feature rollouts.
Microsoft emitió una solución de emergencia para un error de inicio de sesión de Windows 11 que causaba errores falsos de "no hay internet", que afectaban el acceso a la cuenta de Microsoft.