New glitch:
First invoice for order sent 1-27-22.
Sent second invoice 1-30-22
Buyer still had not paid by 2-1-22 but couldn't cancel sale for NPB because Ebay glitch changed the sale date to the 30th on the invoice, not the 27th.
So, now stuck waiting until 2-4-22 to cancel sale for NPB. Rep said to cancel using 'Buyer requested sale cancellation' but that's not what is going on. Buyer is just choosing not to pay.
Tip - don't send a second invoice.