Error 404 using JitsiMeet API

Hi everyone, I have a web-app that I often call meet.jitsi (API) for videoconferencing. Sometimes I get the “404” error as if it can’t find the domain. But I always call the same domain “meet.jitsi.si”. The domain variable is constructed as follows:
var domain = “meet.jit.si/”+roomName;
The roomName is a simple text variable fix by the master user of the app.
What could be the problem?

Thanks to those who will help me.

You have domain param and room name param, you should not mix both.

Thank you.