Do you mean that it doesn’t work at all or you can’t find a running server in automatic mode? It’s just that macOS “cares about your security” and does not allow the use of UDP broadcast, which is used on other platforms to automatically determine the server address. If this is the problem, then you just need to manually specify the address of your macOS device in the application.
I apologize for such a delay in responding. itch.io doesn’t send me notifications for some reason :(