This code is a bounceback offer. Those who are getting agents to use it are not supposed to be using it. It is for those who are currently staying on property at Disney who want to book for next trip. I know there are some who claim to have gotten it to work, but that's not what this code was intended for. You can try and call and see if you can get it to work, but I'm betting against it happening. Some have claimed it was for a percentage off, other claim it was for free dining. I think that they have gotten a cast member who has applied a different pin or code and not necessarily the DY9. Good luck in whatever you decide to try.
I can use my bounce back code which is different than DY9. i called during my stay in may and what i wanted wasn't available so I was told I could call back and keep checking.