I just now purchased the new Roku Streaming Stick 2016 version from Walmart and it includes a $5 vudu promo. The slip of paper with the code tells me to redeem it on watch.vudu.com/roku, but when I go there, I get a 404 error that the page doesn't exist.

I've also tried redeeming the code on the movie credits page, but that gives me an error that the code is invalid.

Where can I redeem this code?