I've been trying to select FP+ selections today and it works a lot better through the website on a computer than it does using the app on an iPhone or iPad. The app is odd and seems designed for parties of 4 or less. Despite our party of 5 having the same FP+ reservations most of the time, it insists that the experiences are only for a party of 4. On the website, it displays "Party of 5" properly and lists all of our names, while the app only says "Party of 4" and leaves my wife off of all of them. Watch out for that behavior if you have a group larger than 4.