If you were targeted and activated the offer before, but came back and “lost” the discount, try clicking the Get 20% off offer banner and click to activate again before proceeding to checkout. You’ll get the red message, “Your points will be applied at checkout but we were not able to activate the promo code. If you have already activated this code, your discount will be applied at checkout,” but when you proceed to checkout you might see the Amex Holiday Promo applied again, just remember to change your pay with points to $0.01 or only 1 MR. Hope this works.