I give up. I changed email addresses over a year ago. There is nowhere in the app to change it, support said they couldn't change it and I'd have to create an account with the new email address (and lose all the reward points I'd accumulated) so I tried today. Nope. Nothing but an error message. I've closed and restarted the app, uninstalled and reinstalled the app, rebooted the phone between all operations, same damn error message. I quit. Spending my points then dumping this permanently.