The pin e-mail I got a few days ago worked for our existing reservation which is a package with tickets and the dining plan. I saved over $400 on my package.
Mine said "Save on a vacation this fall, Carol" Sent on 8/3 for me, but I had heard about it earlier.
Try calling Disney & asking if there is a code associated with your name. This is what I did (yesterday) when I called & saved $500+. (I had not seen my e-mail yet.)