I think a lot of people have already posted about this, but after you complete your first PVP in order to play the next level on the story, you are directed to open a PVP deck. When I open it it says that I have no connection (even though I was sitting near my router sometimes and even tried my cellular data) and won't let me click on any other buttons, even the one to open the deck.

I have iOS 11.1.1 and an iPhone SE.