I just finished flying a 4-segment round trip all in P class. I entered my A3 membership # into the booking. However, the miles did not automatically get posted in my A3 account. Therefore, I made manual entries on the A3 website to request credits.

These flights were operated by AC but bought on UA paper. A3 accepted 3 segments, but rejected one, citing the following error:

"43-Ticket not eligible for credit, lifted or exchanged."

All the segments were discounted biz, in the same booking class. I just don't understand why A3 selectively gave me credits.

​ What should I do now to claim this missing credit? This is for the longest flight. Thank you very much.