Ok, I haven't been keeping up throughout the day so I probably missed the post when
@jhoannam booked this, BUT I'll throw my 2 cents in anyway. If the UR travel dept is a
travel agent, which they should be since they said they can book anything you see on the Disney site, they should be able to book your reservation using your PIN. We've done PINs with travel agents before, so you should just have to call up the special department and they take it from there. Then since you can pay for those reservations with the UR in theory you should be able to on this as well.
And I just saw this, so I did miss the post
Did you book with Disney or did you call Chase?