Installation on Fedora32


I am trying to install a Jitsi server on a Fedora32 and I have some problems.
I successfully launch the server from behind a NAT
and I can access it from external as well as from LAN.
But every time someone try to join a meeting he instead end up in a separate room !
I have tried both http and https interface, both internal and external IP and both Firefox and Chrome.
In the .env file I specified my DOCKER_HOST_ADDRESS as my external IP (not the 192.168.#.# one).
I have not been able to activate let’s encrypt, I think it is because I have no domain name (I connect directly through IP address), so I have to click “accept the risks” in https.

Does anyone have an idea for something I did wrong ?
Thanks a lot