Hi, Katherine!
Regardless the season,
FastPass+ selections are able to be booked. A few things may have happened when you tried to book.
-FastPass+ can be booked up to
60 days in advance. You may have just been a day or so too early to book. Another reason may have been that you are not staying at a Disney resort. Non-resort guests can book at the 30 day window.
-Each member of your travel party needs to have valid park admissions linked to the account in order to reserve FastPass+ selections. Check your
My Disney Experience account to make sure tickets are linked.
-There might have simply been a system glitch. Mickey and his team work hard to keep the website up and running, but sometimes an update may be getting pushed through, so always just try again a bit later.
Hopefully, you have resolved your issue and have your FastPass+ plans made. If you continue to have trouble, call (407)939-7765 and a friendly cast member at the internet help desk can assist you. Sending pixie dust wishes your way that you got all of your magical FastPass+ selections secured!
Cathy