I just tried this for a 1BR stay at Clearwater Beach from 10/31 to 11/2, so definitely should be in the window to do this, I got to the screen where you chose traveller, and was never presented with this dialog. Is it after this? I didn't want to get stuck making this reservation because it's inside the "no cancellation" window.
Now, I can't try again because of the dreaded "multiple transactions in progress error".
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One last thing, does anyone know if this works in conjunction with VIP suite upgrades?