A FlyerTalk Posting Legend
Join Date: Sep 2002
Location: LAX/TPE
Programs: United 1K, JAL Sapphire, SPG Lifetime Platinum, National Executive Elite, Hertz PC, Avis PC
Posts: 42,198
Many airlines do not allow online seat selection if a flight is not booked on their website. Air Canada, Asiana are two examples - now you found another. Just call the partner, give them the confirmation and they will assign you seats - which should miraculously show up on your UA reservation when viewed online after the records have a chance to sync.