why do I get this message when attempting to reset my security questions?

Why do I get this message when attempting to reset my security questions? "The security information you’re trying to reset is not associated with the Apple ID provided."

I am trying to help my son fix his set up but I keep getting the error message after I do the following:

- I so all the steps to reset security questions.

- The I go to the email I received and click the link

- I put in my son's Apple ID and Password in correctly and then I get the error message in RED under the login section....

WHY IS THIS HAPPENING?!?!