Stack with Obtaining a Signed TLS Certificate

I installed jitsi on anUBUNTU 20.04 but I may have made some mistake in the domain name wher somewhere in the configuration I put jitsi as the domain name.
I’m stack in the step wher I try to Obtaining a Signed TLS Certificate
I get:

An unexpected error occurred:
The server will not issue certificates for the identifier :: Error creating new order :: Cannot issue for “jitsi”: Domain name needs at least one dot

Can someone redirect me where how to fix that?
Thx

If you haven’t done much customisation, better solution would be to reinstall, this time with proper domain name

Thx. I’ll follow your advice and srart from scratch but one qestion though; Can i install Ubuntu desktop as a server instead of using an Ubuntu server?
Regards
I. Lesher

בתאריך יום ד׳, 28 באפר׳ 2021, 22:00, מאת Prashanth via Jitsi Community Forum - developers & users ‏<jitsi@discoursemail.com>:

Don’t think so. I remember reading about few others having issues with Ubuntu desktop and all was good once server was installed.

Thx