Retro-claim if A3 number wasn't in booking?
Searched for this answer but couldn't find an answer. Is it possible to retro-claim for a flight if I forgot to add my A3 number to the booking? I have done retro-claims in the past for TG flights that didn't credit but in those cases I had always actually entered my A3 number when I booked the flight. Just waiting for enough time to pass for this recent flight but worried I cannot credit for this reason.