joemama53 I normally play on iPad using email, but I have to go to the portal on desktop if I want to buy pillars.
see if you can get onto the game using email on iPad, and if you access your same game with your current progress.
p.s. Make sure to log out of where you normally play, so you don't get the error message. Note that "email" is one of the two options offered at log-in on iPad.