AliExpress shipping information is powered by “Cainiao”, which is a quite different tracking system compared to 17TRACK.
Cainiao creates their own shipping numbers, but only the official carrier's original tracking numbers can be tracked via 17TRACK.
Besides, Cainiao is usually for small and low valued packets; partial of them are economic surface mails without full tracking capability.
More importantly, your destination carrier couldn't identify cainiao's reference numbers either.
Only if you get an original tracking number it could be tracked by our system and your local carrier then.
As Cainiao is like a tracking platform as 17TRACK, and 17TRACK mainly focuses on adding international shipping carriers, we are unable to support a similiar tracking service like 17TRACK.
For your information, as most of Cainiao's numbers can be actually found in 17TRACK's system, For instance, number LP0000000008, please select the carrier as Yanwen, we will get the tracking information from Yanwen and display the exact same information as on cainiao. The most common carriers on Cainiao are: Sunyou, yanwen, 4px, direct link, post11, Asendia, Aramex and more. Some economic flat-rate mails aren't trackable.
For further guidance, please contact us at email@example.com and we'd love to guide you on how to track Cainiao shipments.