FSLogix Login Failure in Azure Virtual Desktop
When using Azure Virtual Desktop, you may encounter the following error when attempting to use multiple desktops:
FSLogix: Logon Failure
The user profile failed to attach.

This error occurs because the FSLogix tool that loads your profile for a consistent experience on the different available virtual desktops can only ever be loaded to one machine at a time.
In most cases, instead of fully logging out of the previous session (using the Start Menu -> selecting the user menu -> Sign out) the window was just closed, which leaves the session disconnected.
If you know which desktop you had been using before, connect back to that one and completely sign out before switching to the new desktop.
If you are unsure of the desktop that was used, please contact the ITS Service Desk and we can help force old sessions to log out from the administrative console.