There could be more than one promotions. The promotion I am trying to register for is:
https://travel-partner.marriott.com/...us/offer/terms
The T&C states:
1. This promotion is only open to Eligible Participants......
A. Marriott Bonvoy Titanium Elite or Ambassador Elite members who have not enrolled in the Preferred Partnership Program, are eligible to register at the Marriott Bonvoy® Travel Partner | United Airlines Landing Page and become eligible for the promotion.
B. United MileagePlus Premier Gold, Premier Platinum and Premier 1K members who have not enrolled in the Preferred Partnership Program, are eligible to register at united.com/MarriottBonvoy and become eligible for the promotion.
.......
GS is not listed as being eligible.