I have been logged in and ready prior to 7a ( about 5 minutes prior ). I'm typically logged in and ready to go. I have once experienced a response that all Fastpasses were given out for a day already, but if that happens just keep trying to refresh or go onto the app that's on the phone. I always start with the hardest FPs to get and work backwards. So for us, we knew we wanted FoP since we hadn't been on it yet and we just trying dates until we were able to get a FP for it.