Microsoft has released multiple emergency, out-of-band updates for Windows 10, Windows 11, and Windows Server to fix two issues caused by the January Patch Tuesday updates.

The first issue impacts Windows 11, Windows 10, and Windows Server and blocks access to Microsoft 365 Cloud PC sessions. After installing the January 2026 security updates, some users may encounter credential prompt failures in remote connection applications.

“After installing the January 2026 Windows security update (the Originating KBs listed above), credential prompt failures might occur in some remote connection applications,” explained Microsoft.