Originally Posted by
Mr. Vker
The Marriott website conflicts with your statement:
- A Free Night Award must be redeemed for the Stay by its expiration date.
- If your Free Night Award expires on December 31, 2022, your Check-In date can be December 31, 2022 and Check-Out date is January 1, 2023.
https://help.marriott.com/s/article/Article-33743
Yes and the app and website accept certs to be used on the day of expiry. I think in fact they just have to be expiring on the first day of the stays.