If you see the CredentialUIBroker.exe 0xc000027b error on Windows when connecting to the remote desktop, see this post for the working fixes.

When you try to establish a remote connection or session on your Windows 11 or Windows 10 computer, you may receive the error code 0x3000046.

A new Windows 11 bug can freeze your Remote Desktop app. Here's a workaround you can follow to fix the problem possibly.