Looks like YunoHost uses metronome and it will get re-enabled with updates but Jitsi needs prosody instead.
Jitsi would stop metronome on install.
SSH as root and run:
systemctl stop metronome
systemctl disable metronome
systemctl restart prosody
It was working fine, but after reboot/update the participants are there but they have no video/sound and there are no errors in JS console.
Just reinstall.