Users are alone in the same room (they don't even see that another user is there but the moderator rights are only given to the first user)

Hey folks
when two users enter the same room, they cannot see each other, which means they don’t even see the small container on the right that is created for each user. However, the first user to enter gets moderator rights, while the second user (as expected) cannot change security settings.
I’m getting a lot of error messages in my browser’s console (see below) and I’ve already read a lot of discussions on jitsi forums and tried different things (regarding muc, bosh, websocket, nginx…) but to be honest, I don’t know what I’m doing there.
So if anyone could help me understand the error message I would be really grateful.
Cheers
Marina

2023-04-27T09:20:40.749Z [JitsiMeetJS.ts] : UnhandledError: Strophe: uF@https://video.cybermentorin.de:9443/libs/app.bundle.min.js?v=6991:136:144165
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Script: null Line: null Column: null StackTrace: 5369/Sa/vt.Strophe.log@https://video.cybermentorin.de:9443/libs/lib-jitsi-meet.min.js?v=6991:2:526045
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Could you check this topic if you have a custom port for Jitsi

thanks a lot. is there a version specific for docker instance?

I assumed your setup is on a typical Linux server. The Docker setup should handle the custom port but I’m not familiar with Docker setup.

According to the error message, clients cannot connect to the backend services through Nginx

If you share more info how you deployed your system, it may be helpful.