Are you trying to get a Fantasmic pkg? Those book up really quickly. If it's a regular ADR, not sure why it's not working for you. Sometimes changing the time 15 min. up or down can help. When I booked our ADRs for the beginning of June, I was having trouble with Brown Derby. I wanted 12:30, but it wasn't working, so I tried 12:15 and it gave me 11:45.