Welcome to planDisney, Becky! Thanks so much for coming to us with your question today.
Magic Kingdom Park is my favorite place to use
Disney Genie+ service, so I'm glad to hear that you're planning to do the same thing. Since you're headed there tomorrow, let's jump right in and talk about when you can purchase Disney Genie+ for your visit.
Disney Genie+ is only available to be purchased on the day you're planning to use it, so that's why you haven't had any success trying to add it today. Since you have valid tickets and
Disney Park Pass Reservations for tomorrow, you will be able to make that purchase using your
My Disney Experience app as soon as the clock strikes midnight tonight. If you're not a night owl, you don't have to stay up late because you can buy Disney Genie+ tomorrow morning as well. I recommend you have that transaction completed a few minutes before 7 a.m., which is when you'll be able to start making
Lightning Lane selections for the day. You'll be able to make more selections as soon as you have used the one you currently have or every two hours, whichever comes first!
I hope this answers your question, Becky, and please let us know if there's anything else we can do to help you plan your magical vacation!
Jessica