We're aware of an issue with Facebook purchases for all King Games and our team is on it. 🛠️ Hang tight while we fix things! You can still enjoy the game, and we'll keep you posted once it's solved.
Just log out of Facebook in the settings for the app (bottom left) then log back into the Kingdom or whatever you were using. You can also try clicking on 'restore purchases' in the settings, maybe this will work.