Not all UPS services provides for tracking notifications, and you can easily recognize them according to the NotificationCode.
First number is the NotificationCode we send in the UPS request:
2: Return notification or label creation - for return Shipments only. Not applicable to GFP (Ground Freight Pricing).
5: In-Transit notification - for return shipments only.
6: Ship Notification - allowed for forward moving shipments only.
7: Exception Notification - Not applicable to GFP.
8: Delivery Notification