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FWIW, I had the same issue for weeks on my wife’s and my app. Tried all phone based solutions in this string. Rebooting our Model S did the trick immediately.
FWIW, rebooting the car did the trick immediately for the app on both mine and my wife’s phone. We had the spinning circle for quite a while. Tried all the phone and app fixes suggested in this thread first. None of them worked.