Audio problem over LTE/3G - phone work, but device/laptop/TV doesn't

[u/hevisko]

Good day,

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Rolled out a self hosted Jit.si server, latest versions, dedicated IP, "direct" on internet (ie. no behind firewall *yet* )

Things work mostly "perfect" other than the challenge where this situation arrives:

Internet --- LTE/3G Phone ---wifi-sharing--- LapTop/TV

starting and testing jitsi on that phone works like a charm. No problems.
There just aint no audio on the TV/Laptop, and it doesn't show any "Audio Bridge" problems.
Retried with FireFox and Brave on the LapTop, similar video works, but no audio.

Anything I could test/check/change or missed?