I just booked with Priceline and called the reservations number to add my Gold Elite number but was told that I can't because bookings with priceline, expedia, etc can't get points for stays. So I asked about incidentals and they said I can do that at the hotel.

So is it not possible to get the number on in advance? I don't care so much about the room upgrade, but free breakfast and room preferences would be great. Thanks