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Hi!
Please see this thread: https://care.king.com/en/candy-crush-saga/being-told-that-phone-is-not-compatible-when-attempting-to-download-candy-crush-saga
You can also delete the cache and data for the Google Play app. This will reset the app and your phone will again be compatible. This article shows you how: https://www.androidpit.com/google-play-not-working
Cheers :-)