You can see the rules for receiving points and nights credit here: https://www.marriott.com/rewards/terms/earning.mi Scroll down to "EARN POINTS". See item #4. Note that past stays may be submitted if they have taken place within the 30 day period prior to enrollment in the program....but must be submitted within 60 days of the stay. I point this out because you may be close on the time period for submitting. Hope this helps.