After Irma (or some other recent hurricane that closed the parks), I took the kids to the parks the day before it closed and the day after it opened. I was always a day-of FP reserver, but in was only any to book a single fast pass even though the parks were dead. I asked a CM, and they said Disney deleted all unclaimed FP spots through the next few days, and the only way to get a FP was if someone happened to cancel their and you snag it up. I forget the reasoning, something to somehow help with staffing I’m sure. Regardless, the parks were so dead, we really didn’t need FPs. We walked in TT 5 times mid-day.
If genie+, is unavailable, I’m going to assume it’s for similar reasons.