Help WHY won’t this app open since I upgraded my iPhone??? AND WHY won’t anyone answer me??? – Blackjack 21 + Free Casino-style Blackjack game Review

I just upgraded to an iPhone XR and this app won’t open! I have no clue why. Anyone? It’s the only app I’m having a problem with.
Review by Greek 0999 on Blackjack 21 + Free Casino-style Blackjack game.