Trouble shooting SimCity Buildit Retrieving Saved Game

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I have attempted to load my saved city multiple times via Apple ID and Game Center, why is it so difficult to load a saved game on this platform? No other game app has this issue when switching to a new ipad or iPhone.  Yes, I go thru the tutorial (which in itself is absurd) and the game directly says you can load a saved city thru Apple ID, Game Center and facebook.  I don’t do freaking Facebook so why don’t the other two options work?