I located my e-certification (free Cat 5) that I hope I have used to book Athens and this is what it now says. Note the part that it will 'automatically deduct the points from my account'. My e-certificate is a free night, so why would points be deducted? Is this something different? If so, it does appear under my Marriott Chase card free night.
Using Rewards e-Certificate for Free Nights
Unused Rewards Certificates may be redeemed as e-certificates for free nights when booking an online reservation. The following request for information will display during the payment process. Select to attach the e-certificate and the free night redemption will be made automatically for you.