Yes, thanks for the help. It took a while on the phone (and I later found out that they made the reservation with first/last names switched), but it eventually worked. They initially offered the basic econ option, but also ask if you want to pay the surcharge for normal economy. I later used United plus points to upgrade my seats, which caused the reservation to get stuck in an error state, but this was fairly easy to fix on the phone. I guess this experience makes me appreciate United's service desk even more.