Netplay issues

Having an issue with running Netplay with a friend. We decided to go straight to Netplay before delving into the more complex Host/Client stuff. We’re unable to join direct to each-others custom Netplay address, but then we can see the “room” that the other person is in and then join that, which immediately disconnects and says unable to join. What should I do?

pingping still looking for help with this issue. I’ll provide any info needed.