You mean the DoT regulations, as opposed to "internal policies," don't you? Doesn't really matter what internal policies say in this regard. Kinda like saying that they have an internal policy requiring that, if you pay for a ticket, they have to let you get on the plane
I just meant that the information given to the agents doesn't spell out the list of exceptions, so theoretically you could run into an agent who tells a passenger that a purchased fare that used a discount code is not entitled to the 24-hour cancellation policy.