We are currently investigating this issue. Users get an error when trying to connect to our AVD server. We have found that Uninstalling Windows January 2026 Security Update (KB5074109) resolved the issue. Users were then able to login. If affected can you have your IT check if these updates were installed on the machines affected and uninstall?
After installing the January2026 Windows security update (KB5074109) caused credential prompt failures during Remote Desktop connections using the Windows app on Windows client devices, impacting Azure Virtual Desktop and Windows 365. The issue affects Windows App on specific Windows builds, causing sign-in failures. Investigation and debugging are ongoing, with coordination between Azure Virtual Desktop and Windows Update teams. January 13, 2026—KB5074109 (OS Builds 26200.7623 and 26100.7623) - Microsoft Support
If you are impacted, please use one of the following connection options as a workaround:
Use the Remote Desktop client for Windows to connect to Azure Virtual Desktop here (/previous-versions/remote-desktop-client/whats-new-windows?tabs=windows-msrdc-msi)
Connect using the Windows App Web Client at windows.cloud.microsoft
Posted Jan 14, 2026 - 10:09 EST
This incident affects: TenEleven (eCR AVD Environment).