Jitsi getting disconnect / behind pfsense + nginx

Hello,
i’ve installed jitsi meet on debian buster, I’ve got the web interface accessible from wan on tcp/443, but once I try to create a room, I’m getting disconnected.
As log error I can find in /var/log/prosody/prosody.err portmanager error Error binding encrypted port for https: No certificate present in SSL/TLS configuration for https port 5281
I don’t find any process running on 5281, nor any config files which mentionned tcp 5281. I’m using my own wildcard certificate.
Thank you for your help