Irrelevancy?  read the OP again.  he is on payment hold because of this 'irrelevancy'.

Sellers are measured on tracking compliance.  The issue at hand is valid tracking is being uploaded but the ebay API link to the Auspost system is broken and it shows the tracking number as invalid.  Checking on the AP website shows the tracking is legit.

They claimed they referred the matter to their IT team.

that is true.  Who knows what they'll do - there is no accountability.