At least your turn server seems to give
code=486: Allocation Quota Reached
when testing it https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/
If your both peers use same credentials, and either of the peers gets “Allocation Quota Reached” error, then the connection cannot be relayed through turn server. Depending on NAT, this can make whole connection fail.

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