If I send the direct push notification (on Player profile page) while the game is minimized, it shows:
Failed to deliver to mobile device. Check that the device is registered for push notifications. Error: iOS Push Notification Failed: Client has been unregistered for push notifications..
I had to close the game, open it and then sent the push. Then I could send it successfully. However, the client didn't receive the push.
Thasnk,
Anh