I purchased tickets with an AP discount. They showed up automatically in
MDE. But I was told I had to go to will call to “activate“ them. And this can be done at any guest services ahead of time. I can’t remember how far ahead it could be done, but I know was at least 48 hours. So if you’re at a park or Disney Springs a day or 2 before your boo bash night, you could stop at GS & get everything taken care of ahead of time.