Hi. I did not manage to get it working with default unreal.
Unfortunately I can’t tell you specific details about the solution we applied, because I simply don’t understand it. I’m not enough of a programmer for that. I believe it involved a separate server that takes care of registering the audio listener in a way that it is handled properly within the primary UE setup. So we need to start that server before we start the application and then my setup in UE which I had hoped would work on it’s own now works as intended.
Another thing I remember is that we were told that the custom solution would not work beyond 4.19 because some changes to the audio related stuff now prevent this from working. I haven’t tested this. All the trouble setting up an easy to use multiuser project on the internet and independent of third party matchmaking solutions killed our development.