I keep getting errors as below, and FedEx API team doesn't know what's going on.
The tracking number in the example(781820562774) works, but all my other real tracking numbers got the failure while they can be tracked on fedex.com

Notification Code: 7025
Notification Message: Sorry, we are unable to process your tracking request. Please retry later, or contact Customer Service at 1.800.Go.FedEx(R) 800.463.3339.