This message was deleted.

Is the customer using FAS? I've seen this once when the connectivity to AzureAD was blocked

Nope at the moment not. If I leave the hybrid join for the machine, it works again

I was thinking FAS as well lol

you set the GPO to disable show last logged in user?

I activate the different gpos to hide the username but nothing works. I found that the sync between azure and local ad are not working and so the user was the problem.