Can't login to AVD using a UPN

Hi Community,

I just deployed a session host in a new host pool (not my first time).

I deployed a DC in Azure (VM). The session host is joined to the DC.

I have assigned my user to the desktop application group.

When I try to connect to with my UPN, I receive the message that the username or password is incorrect.

When I try to connect using DOMAIN\username, it works.

I can't figure out why it doesn't work.

The domain is verified. AAD sync works fine and on tis e nvironment, I already have a host pool but with AVD Classic (which works well when I'm connecting with my UPN).

Any advice on what I can check ?

Thanks for your help.

D.