Quick install & secure domain

I have installed jitsi-meet, following the quick-install doc, on Ubuntu 18.04. That’s ok.
But after configuring Secure domain , if I launch a conference, I am not aked for registration. I have the message “You have been disconnected”.

Any idea ? Thanks for your help.

I found the source of the problem. My server has a FQDN and a alias. I configured all jitsi-meet with this alias. If I connect to https://alias/, no authentication. It works only if I configure with the FQDN and connect to https://FQDN/.
So my question is : is it possible to use alias with jitsi-meet ?
Thanks for your replies.