I booked four nights at ARIA using the Citi Prestige 4th night free benefit, so the reservation is under my name.

However, the friend that is staying with me has Hyatt Diamond and therefore Mlife Platinum.

Is if possible for me to add his Hyatt and Mlife loyalty accounts to the reservation for elite and point earning purposes? If so, do I have to wait until we check in or can I do it ahead of time?


Thanks!