Can’t sign in with Facebook – Fish Blast - Best Ocean Crush Match 3 Mania Game Review

I try to log in with Facebook and it lets me sign in then says, “ App Not Setup: This app is still in development mode, and you don't have access to it. Switch to a registered test user or ask an app admin for permissions.”
Review by 111kelseyblehh on Fish Blast - Best Ocean Crush Match 3 Mania Game.