This is an ongoing issue.  I've let Ebay know.  They do nothing.

There is clearly a technical glitch, an API error, that is impacting the connection between Auspost and ebay.  Ebay will show the tracking number but it isn't connecting to Auspost correctly so it doesn't get confirmation of the item's shipment or arrival.

The biggest potential impact of this is payout holds associated with 'poor tracking performance'.  Every time this glitch occurs Ebay defects you because as far as it's system is concerned you've not entered a valid tracking number or have not shipped the item.

Has anybody escalated this to somebody other than the clueless muppets on the chat line?  A category manager or account manager etc?