It doesn’t really matter where you get your tickets from, just as long as you have a ticket number to link to your account so you CAN make park reservations. You can’t make reservations without that. I had my tickets for several weeks before I even was able to make my park reservations, so I was pretty happy when they opened it up to be able to book at 120 days out. I’m not sure when your trip is, but they’re allowing booking to mid-October at this point…