Try calling......but they have also done this for me at the Parks guest relations. It used to be of course! we do this all the time! And now it seems to be a little hit or miss. They said it was not ok (sometimes)because it was a way to get around the 4 days of FP+ for CM guest limit (and I was thinking, well yeah, I have a room booked, and I am not local, lol, so that is exactly what I want to do).
I think it is somewhat different when it is because they lifted a block though..... Not the same thing as trying to keep 5-6 days FP+ reserved.