This freebie has been around for a long time (but it “sells out”, then comes back, etc), so if you got it before you probably won’t be able to get it again.
Click here for a free sample of Dunkin’ Donuts coffee. Choose from Original Blend or Dunkin’ Dark
not sure if I am missing something, but this link went to a “thank you” page, not to the one to register for the free sample.
I just tried it and it’s working for me! It may have been “glitching” when you tried it before!