
Windows 11 March Patch Triggers Sign-In Failures in Office and Copilot Apps
Windows 11’s March 2026 update KB5079473 for 24H2/25H2 can cause sign-in failures for Microsoft accounts across Office, Copilot, and related apps (Teams, OneDrive, Edge, Word/Excel), showing an “Internet is required” error even when online; a restart may temporarily fix the connectivity state, with a fix expected in the coming days; the issue affects OS build 26100.8037 and has no server-side impact.












