No Video, no audio in same network

I’m just doing a little testing with Jitsi Meet. If it works out, a really great and simple solution. Well if.

A woman can’t even get into a meeting with her mobile phone on the Kuketz Meet server. All attempts to solve the problem have failed. Another server, the Uni #Duisburg works.

Then there are problems if the participants are in the same WLAN. The people are in the meeting, but then the sound does not work, but mostly the video transmission does not work.

I’m just doing a little testing with Jitsi Meet. If it works out, a really great and simple solution. Well if.

Then there are problems if the participants are in the same WLAN.The people are in the meeting, but then the sound doesn’t work and video is not transmitted.

If a person changes to another WLAN (Freifunk), one participant in the normal WLAN and the third person via UMTS, this works perfectly.
The people are in the meeting, but then the sound doesn’t work and video is not transmitted.

If a person changes to another WLAN (free radio), one participant in the normal WLAN and the third person via UMTS, this works perfectly.

Has anyone perhaps had a similar experience or suggested a solution?

All participants use the latest Android app. from the Appstore (20.1.0 build 3883698)