OP is traveling on an IB-issued ticket. AA ought not to touch the ticket until the day of travel. While it is theoretically possible to pay the takeover fee, it also risks gumming up the ticket.

The error here is a common one. It can be fixed on the day of travel and there is no reason to pay extra fees or spend hours on the phone and risk having the ticket loused up.

Just do as advised and fix it at the counter on the day of travel.