VUDU copy of Detective Dee and the Mystery of the Phantom Flame problem

[Clark Kent]

Apparently Walmart included a VUDU digital copy with their version of Vivendi's Detective Dee and the Mystery of the Phantom Flame. It's included on a sticker on the slipcover. It appears to be one of the codes from the early days of VUDU, because it uses the non-specific

http://www.vudu.com/redeemecopy.html?api=vudu

entry method. The code keeps returning invalid code, and I don't know if it is because the code has expired or not. There is no actual expiration printed on the sticker itself. Since I just bought this out of the $7.88 bin today and it looks recently manufactured the code should work, or is this simply old stock that was thrown in the bin?