I had messaged usps and this is the response I rec'd (of which I was pleasantly surprised how quickly they answered my query)...
"We do apologize for the delay.
Even though stamps are issued, regular press releases authorized, and the items get posted on the Postal Store, we have to get additional authorization from HQ for what gets put onto
ebay. Yes, this is less than optimal, but we are still required to follow these procedures for the time being. We do thank you for your business and your patience."
Hopefully USPS's HQ authorizes listings soon.
Regards,
Stampalotapus