In WebRTC, I can establish a connection on my own computer, but I cannot connect over external networks

https://github.com/chillyen/Funny-cat/blob/main/src/components/ChatInterface.svelte
In the ChatInterface.svelte file below, I have confirmed that my STUN and TURN servers can connect. However, in my tests, when I open Chrome and Edge on my computer and pair two users, they can connect to each other. I suspect that they might be using an internal network and not actually connecting through the TURN server. But when I try with a mobile phone and a computer, two different devices, they are unable to detect each other joining the same room server.Connections can be established in different browsers or on different devices.