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Microsoft's January 2026 security update broke authentication in Windows App, preventing users from connecting to Azure Virtual Desktop and Windows 365. The issue affects all supported Windows versions from Windows 10 Enterprise LTSC 2016 through Windows 11 25H2, plus Windows Servers 2019-2025. Microsoft recommends using the Remote Desktop Client or web client as workarounds while they prepare an out-of-band update. A Known Issue Rollback is reportedly available but not yet officially publicized.

Windows App breaks logins with first 2026 security patch