Error Code : 400 Error Description: Some argument of the input was invalid. Possible status codes include: InvalidRegistrationId InvalidData InvalidConsolidationKey InvalidExpiration InvalidChecksum InvalidType Unregistered Notes: Unregistered indicates that the app instance associated with the registration ID is no longer available to receive messages. Reasons that you can receive an Unregistered status code include: The owner of the device on which the app instance is registered has changed. The app instance has requested to no longer receive messages. InvalidRegistrationId indicates that the registration ID does not correspond to the sender identified by the provided access token.