I’m having a similar issue. I have installed the docker Jitsi meet server and I’m able to connect through web browsers with no problem. I can connect using the mobile client on Android 8, but I’ve tried 3 different devices with Android 7 and it won’t work, even though it works fine in the mobile web browser in desktop mode. I get an error in the Jitsi client saying:
You have been disconnected. You may want to check your network connection. Reconnecting in xx sec…
I’m using 20.2.3 build 202030.
I’ve checked my Let’s Encrypt certificate at https://whatsmychaincert.com and it is successful.
I also tried updating my web/config.js BOSH url to the full address instead of relative, but no change.
There is a similar post at https://community.jitsi.org/t/android-7-clients-disconnected/34182