Knocking on lobbies doesnt work, suspect stanzarouter

Hi all,

i just reinstalled jitsi and added authentication. The issue is that i cant allow people to join when the lobby feature is activated. I already checked the lobby feature help, but you can only request access, the allow popup doesnt show.

prosody.log shows the following everytime a lobby is enabled by a moderator (on flipping the lobby switch):
Sep 09 17:07:46 stanzarouter warn Received stanza with invalid destination JID: room@lobby.fqdnroom@lobby.fqdn/xxxxxxxx

The only related thing i could find was on Github, but i think its unrelated and i also dont have trailing slashes.

The installation is on Debian 10, i tested it clientside with Firefox and Chrome.

Grateful for all help!