First and foremost make sure it's a Reward and not a Coupon. The difference is fairly easy to tell. Any Reward will only ever be $20 and it will actually say "Reward" on it, right on top of the $20. (So the full thing will basically read as $20 Reward) Coupons will be either $10 or $20, and won't have the word "Reward" by itself, but they'll still say "Winners Circle Reward Program". They'll also say "Save $10/$20 on your next purchase of $60/$100 or more".
If you're sure it's a Reward, make sure it's not expired, and then try placing it in both boxes when you're getting ready to checkout. There's one for coupons and one specifically for Rewards. From my experience, it really doesn't matter which box you put the code into, so again try both. If neither accepts it, then contact FNL to see what the problem is.
