We have instant Book enabled as well as a requirement for 24 hours notice for a booking but we do allow booking requests within this 24 hour period.
Anyway a guest booked at 7pm to check in at 4pm the next day - something the system should have rejected. Luckily we were able to get the apartment ready BUT Airbnb support seem incapable of understanding why this is a problem and presumably even less capable of solving it.
Two operatives have tried to tell me that the system is working fine (it isn't) and eventually they just pass me on to someone else.
At the end of the day if they do not sort out the problem then we will be forced to cancel a guest if we don't have time to get ready which would be a shame just because Customer Support can't understand why there is a problem.