It might be server location of the TURN/STUN server? I don't know where they are based.

let answerSDP = await response.text();

in particular, after recieving the SDP information, the loading of video takes quite some time. Also, the WebRTC can be open but the Cloudflare dashboard will show "disconnected" yet the stream is still working. It's all Beta so I don't expect perfect results. Just noting what I see.