Bought the stock during the pandemic, applied and was denied. The restart happened, bought the stock again, applied and denied. There was a whole thread about it. Guessing whomever reviews these (computer or human) automatically denies it if the fare amount is $0 but hopefully they approve it if it's more than $0 (CC/AQ is $10-$20/night)
Right after the restart there was a trick where you could apply both Capt Club benefits and MGM Rewards which had a $200 OBC. It was reported on here, then the next day someone reported they tried to add the MGM benefits and the rep said a policy letter just went out saying you can no longer double dip