Hey guys,
if you are behind a NAT, try to NOT set listening/relay/external IPs. These are only required when not behind NAT and I also faced issues when setting them.
Also disable TLS in coTURN. Nextcloud Talk does not use it (regardless of chosen port) and it has no security benefit anyway. WebRTC is encrypted out of the box ;).
Read to compare: HowTo: Setup Nextcloud Talk with TURN server
In the changelog at the bottom of the howto you’ll find the links to TLS related discussion.