So I can join any multiplayer myself and can join a random squad in the games when required. I have the VIP thing as well.
My NAT is open according to the network test. I don't get a pop up or exclamation in one of the 5 circles between I think the router and Xbox.
Playing with friends in a party is a problem. When I accept the game invite, 1 of 2 things happens.
1)"Cannot connect to EA servers"
2)"Kicked from squad"
Again, open NAT and I can play the regular multiplayer stuff no problem by myself.