Okay me and my brother both seem to have the same problem with our Gold Cup as we are both in the final, when it we go to start the match an error message will show, saying it cant create the game session. Why I think the problem is occuring, is the fact that on the UT where it shows what Tournament you are in the moment and where you are, it says i'm in the round of 16, is there anyway I can resolve this issue??

What I've tried:
Starting the Tournament game from different places on the Tournament Tree screen

Turning the game off while in the tournament

Any help would be greatly appreciated!!