Unable to configure coturn to run on tcp port 443 exclusively

The situation: webrtc is not compatible with many corporate firewalls as it is, turn is necessary and it has to accept all traffic on port 443, this is a major problem for some of my coworkers.

I’ve been trying for quite some time to figure out the correct configuration to make this happen, as some commercial webrtc-based services do. I do have a valid ssl certificate in place but when I click to test the server in nextcloud, specifying “tcp only” I get an error, nothing in logs. chrome://webrtc-internals/ reports error 701 when trying to send audio or video to the room.

I’m resorting to this forum in hope that many have already faced a similar problem and someone has figured a working solution.