Then they got someone who has no clue. You will get elite bennies. You won't get night/points credit. Call the property & have your MR # added to your account. Worst case bring you elite card w/ you & present it at check-in. Marriott extends 'elite recognition benefits' re: of how a stay is booked, which is one of Marriott's advantages. However, it does not extend night/points credit on stays booked through non-Marriott channels. You would get points on incidental spend at the property if it's a full-service property, which the JW HKG is.

Cheers.