Media stopped working when I added security

Like a lot of people I just installed Jitsi on a personnal server to talk with my family during quarantine
Jitsi is installed on a VM that has its own public IP, fresh debian10 installation
I followed this installation procedure :

then tested it :

  • created a room on a computer
  • connected through another computer
  • even added a connection from my smartphone
    ==> no problem found

since this is a private server, I wanted to add the security as described here :

then 2 things happened

  • video and sound are not transmitted anymore (all stats are N/A in the little graph on the corner)
  • then starting a few minutes later, the room crashes as soon as a second jitser connects
    I tried connecting with FF or chrome, I get the following error :
    <iq xmlns="jabber:client" type="error" id="71903c69-379e-4968-a80d-3cefd55cb697:sendIQ" from="XXXX@XXXXX/edfe12c2" to="wmsxas396hdl_wkm@guest.XXXX@XXXXX/PWf4RPrR"><error type="cancel"><item-not-found xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/><text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">Recipient not in room</text></error></iq>

while the screen displays this :


I can upload logs and conf files if you need


found it :
I followed the solution in this ticket

JVB_OPTS was empty in the “/etc/jitsi/videobridge/config”, added xmpp,rest