I have IPv6 enabled but looks like my console is always on IPv4
My NAT is OPEN, no UPnP and no port forwarding, xbox is on DMZ, like I said before, looks like UPnP on 3.0 doesn't open any ports for my xbox or ps4, but I'm not 100% sure, I didn't test it when I put my xbox into DMZ.
My friend isn't in any insider program on pc or console, neither am I
Yes we were both playing the same game and we can talk on chat in game.
Doesn't matter how many people are in the party, every time my friend from PC joins it only disconnects me, even if I'm party leader, then I cant connect back to this party, even if my friend from PC left.
And just like @Glitch x2 I'm using R1