We have FPP selections picked for a family trip, multiple days. On the Friday of our trip, we have a friend joining us for the one day. He has an Annual Pass (AP). How (or can) do we add him to our FPP reservations?
Go to “my friends and family” and send them an invitation to link accounts and you can make/adjust reservations for each other.
You will need to do more than just link accounts. After linking you need to copy your FP+ selections to the new party member.