Ubuntu Server 20.04 LTS - can't assign to account

Hello,

I installed TeamViewer on my Ubuntu server. When I'm trying to assign it to an account, the dialogue stays stuck. If I'm trying to log in, the fields are none responsive (see attached screenshots).

I tried running the setup as root, but it keeps telling me there's a communication issue.

I can't see anything significant in the log files (I can share them if needed).

Any help will be highly appreciated.

Thanks, Joe