I see this thread is from February, but I've just experienced the same issue today... What can I do?

UPDATE: I called QuickBooks Online Support and rep said he had to escalate this issue to level 3; He said others reported this same issue today; He advised that I will get an email from the engineer's once issue is resolved; He further stated that I could wait a day or two to see if the invoices go out before I begin the daunting task of manually sending hundreds of invoices;