AA returned my purchase the day after I made it. Bought $100 GC with AU card and it went through just fine. Noticed a credit and was super happy. Then I notice it came from AA. Any idea what may have happened? I also tried $200 from another AU and transaction went through. Then, I go to redeem the card and there's a problem. I went and checked CNB and the transaction never even posted, wasn't denied, etc. Any guess what could be happening?