Using the below code, I am not seeing any sandbox notifications to our url or email.

John

 SetNotificationPreferencesCall apiCall = new SetNotificationPreferencesCall(usrApiContext);
 var appPref = new ApplicationDeliveryPreferencesType();
 appPref.ApplicationEnable = EnableCodeType.Enable;
 appPref.ApplicationURL = "http://oururl/eBay/notification/receive";
 appPref.AlertEnable = EnableCodeType.Enable;
 appPref.AlertEmail = "mailto:jo...@xxx...xxx.com";
 appPref.PayloadVersion = "989";
 appPref.DeviceType = DeviceTypeCodeType.Platform;
 appPref.NotificationPayloadType = NotificationPayloadTypeCodeType.eBLSchemaSOAP;
                         
 var usrPref = new NotificationEnableTypeCollection();
 #region Setup Notifications
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.AccountSummary });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.AccountSuspended });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.AskSellerQuestion });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.AuctionCheckoutComplete });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BestOffer });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BestOfferDeclined });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BestOfferPlaced });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BidItemEndingSoon });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BidPlaced });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BidReceived });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BulkDataExchangeJobCompleted });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BuyerCancelRequested });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.BuyerResponseDispute });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.Checkout });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.CheckoutBuyerRequestsTotal });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.CounterOfferReceived });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.EmailAddressChanged });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.EndOfAuction });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.Feedback });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.FeedbackForSeller });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.FeedbackLeft });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.FeedbackReceived });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.FeedbackStarChanged });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.FixedPriceTransaction });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemAddedToBidGroup });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemAddedToWatchList });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemClosed });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemExtended });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemListed });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemLost });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemMarkedPaid });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemMarkedShipped });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemRevised });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemRevisedAddCharity });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemsCanceled });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemSold });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemSuspended });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemUnsold });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ItemWon });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.M2MMessageStatusChange });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.MyMessagesAlert });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.MyMessagesAlertHeader });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.MyMessageseBayMessage });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.MyMessageseBayMessageHeader });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.MyMessagesHighPriorityMessage });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.OutBid });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.PasswordChanged });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.PasswordHintChanged });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.PaymentDetailChanged });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.PaymentReminder });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.PlaceOffer });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReadyForPayout });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReadyToShip });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.RefundFailure });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.RefundSuccess });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.RemoveFromWatchList });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnClosed });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnCreated });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnDelivered });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnEscalated });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnRefundOverdue });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnSellerInfoOverdue });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnShipped });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ReturnWaitingForSellerInfo });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.SecondChanceOffer });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.SellerClosedDispute });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.SellerOpenedDispute });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.SellerRespondedToDispute });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ShoppingCartItemEndingSoon });
 //usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.ThirdPartyCartCheckout });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.TokenRevocation });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.UnmatchedPaymentReceived });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.UserIDChanged });
 usrPref.Add(new NotificationEnableType() { EventEnable = EnableCodeType.Enable, EventType = NotificationEventTypeCodeType.WatchedItemEndingSoon });
 #endregion
 apiCall.SetNotificationPreferences(appPref, usrPref);