https://www.marriott.com/rewards/terms/earning.mi
A member is eligible to receive points/miles for staying at participating Marriott Rewards hotels for his/her guestroom and up to two additional rooms. At least one of the rooms must be reserved and registered in the member's name and the member must pay for all rooms, which must be requested at time of hotel check-in. The member must also stay in one of the rooms. To ensure points are automatically posted to member's account, the member's Marriott Rewards number must be present on his/her guest room folio and up to two additional rooms, as applicable.