Hello....my game Kool Kicks just went live this weekend. I downloaded it from Amazon's app store. On my oldest Fire tablet it logs in fine as my user name. But for my other two Fire tablets, newer ones...they sign in as Guest. These three all worked fine when installing the APK directly. But from the appstore, two out of three are "Guest". Code is the same for all three, seems like it's something on Amazon's side of the fence. Any suggestions?