Originally Posted by
bocastephen
Many airlines do not allow online seat selection if a flight is not booked on their website. Air Canada, Asiana are two examples - now you found another. Just call the partner, give them the confirmation and they will assign you seats - which should miraculously show up on your UA reservation when viewed online after the records have a chance to sync.
yes unfortunately that will not work now for AC (while it did for PMUA), IME