Hello, im trying to play with my friends, but our games just don't connect, is like they lost the connection or someone leave the game. I really don't know how to fix this, that's happening with R6 and State of Decay 2 too, is a problem in Xbox servers? 
I sorry for the bad english, i'm brazilian.

I'm facing the same issue. Were you able to resolve it?

Se você for brasileiro, o problema estava na conexão do Teredo, no entanto não consegui resolver. Acredito que o problema seja no meu roteador.

The problem is the Teredo connection, idk how to solve it, after a lot of attempts i just give up. I guess the problem is my router so idk how to make that work right...