BOG fastpass for lunch

Having trouble with reservation number. It is booked thru DVC and number is longer than one booked thru Disney. Any advice?

How many days out are you? What message are you getting? I never had to enter a number. My resort stay was linked, simply clicked the BOG url, logged-into MDE, and got my reservation at something like 25 days out (not 27 as many have experienced).