Hey Guys,
Me and my friends bought the game aswell and fixed the problem.
We have tried everything, from reinstall game to everything with connectivity.
We were almost done with searching cause no one had the right answer for us.
But we got it! hope its the same for you guys.
The answer was very simple.
The first time you play multiplayer you need to play a prologue.
When you choose for create lobby you see: "Enter proving grounds" or something like that.
Everyone needs to play this proving ground first or you got different data.
We bought this game with 4 people, 1 of us had this problem.
He played the proving grounds, and the problem was solved.
Its weird that the prologue doesnt start immediatly or that they send you towards the proving grounds.
But Cheers, Hope its the same for you guys!!!