I got an email. They just said that since I only had my name on the reservation, I wouldn’t be able to register for more than one person and I wouldn’t be able to add more people later without losing the MM reservation. It’s not the end of world, but slightly disappointed in myself for not figuring out the exact details ahead of time. I did the name modifications right now and will try tomorrow just to make sure it doesn’t work, but it seems like we likely won’t end up at moonlight magic. There is an H20 glow party during our trip, so if we really want to have a similar experience, it is a problem that money could still solve in the end lol.