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#11
If you select (highlight) the 'PushNotifications' key that you have previously found, 'AppDB' should be an Binary Value entry on the right side of the screen. If so, this is what you need to delete. If not, then I'm sorry I don't have any other solution for you. (It might be easier to find if you do a registry search.) Again, I strongly suggest you either do a registry backup or create a System Restore Point before modifying the registry.
System Restore Point - Create in Windows 10 - Windows 10 Forums