I had a similar issue with international postage aswell.
A product that came from Hong Kong had a valid tracking number and all was fine but when "Hong Kong Post" handed the package to "DHL" it was invalid.
Might just be that "wnDirect" doesn´t provide tracking numbers or it is a scam.
In either case you should be fairly fine since you should have ebay buyer protection
Looking forward to you being banned
A day without all these Trump threads