Windows 10 - XBOX Crossplay port forwarding

[Jonathan De Felice 0]

Hey everyone, 

I bought 2 copies of Astroneer today (a PC version from Microsoft Store and XBOX one), so that my son and I can play co-op together.

The problem is that we can't join each other's game session due to, as I have learned, the same ports being forwarded on the router. I've found out which ports I should open, but both for the pc and xbox version the ports are the same. How can I make sure either of the copies uses different ports? How will the game know how to use the new ones?

Thanks for the help.