This was found in Game Code as of Hotfix 1186 by your friendly Data Miners:
Star Wars™: Commander will no longer be playable on Amazon devices starting on January 7, 2019. While you can continue to play until then, we are no longer accepting payments from Amazon devices. To continue playing the game on iOS, Android or Facebook Gameroom, please Facebook connect in-game on your Amazon device before January 7, then Facebook connect in-game on your platform of choice. Thank you.
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