502 errors on /http-bind/

I use the latest docker-jitsi-meet on branch master. When I start the compose project I’m able to access the interface on http port 8000. The first GETs in the brower are 200 ok.
Then in developer console I see a 502 on a POST on http://my domainname.com:8000/http-bind?room=sadasd
I have no audio, no video but for the rest the page seems to load ok

any idea why? here is my config .env

CONFIG=~/.jitsi-meet-cfg
HTTP_PORT=8000
HTTPS_PORT=8443
TZ=Europe/Paris
PUBLIC_URL=https://visio.axelingo.com
DOCKER_HOST_ADDRESS=51.210.151.0      (this is my public ipv4)
XMPP_DOMAIN=meet.jitsi
XMPP_SERVER=xmpp.meet.jitsi
+ secrets here

Could you help troubleshoot. The host is a centos8 box