It isn't just AP-holders. We have regular tickets and I'm still not able to get a reservation for our last park day (departure day) because it says we have maxed our reservations (I previously had a reservation for that day and cancelled it to change it, but now it won't let me make a new one. Not going to take a chance on cancelling all our other 5 days of reservations to retry.)
If we aren't able to get it, not the end of the world, but still kind of annoying because I don't feel "done" yet so keep feeling the need to check back every so often.
This same type of thing is happening to me.. has anyone talked to Disney IT about this ? It’s crazy when do we think this will be fixed by?