Hi @Luphina,
Can you help take a look at our docs related to WebRTC: https://docs.mattermost.com/deployment/webrtc.html?
Can you also help take a look at this thread for troubleshooting tips: How to start WebRTC?.
Some tips include:
- adding this value to the config.json
"StunURI": "stun:stun.l.google.com:19302", without updating the Janus server or any code changes. - setting the nat mapping in the janus cfg.