Can’t buy in the game. Says - in app purchases are not allowed - then says - can’t connect to i..

This sounds like either a problem with your itunes account or a bug in the game. Assuming your iTunes account is working correctly and you haven't blocked the app from making purchases via your account then you may need to contact the game developers to report the issue. There is an in game contact form in the support option. Check How to get help in the game for more contact details.