Make sure and cancel any fp's you don't use, even if the time has passed or it may not let you make a new one. This happened to me a couple of times and I had to go to a kiosk to get extra passes. The cm told me to cancel any unused passes, then make the new one. That worked. Even if only one of my party didn't use his/her FP, I couldn't make a new one for him/her, even though the time had passed, unless I went in and cancelled the one they missed.