public IAsyncAction RegisterAsync()
 {
     return(Task.Run(async() =>
     {
         await _clientChannel.RegisterAsync(new Registration
         {
             Name = RegistrationSettings.Name,
             UserId = RegistrationSettings.UserId,
             Domain = RegistrationSettings.Domain,
             PushNotificationChannelURI = RegistrationSettings.PushNotificationChannelUri
         });
     }).AsAsyncAction());
 }