I called in as well, confirmed my 1st stay began before the promotion start date. Check in day is what counts, not checkout.

My 2nd set of 3 stays has now posted. 5k bonus posted same day as the 3rd stay points. They are on the ball with this one.

Finishing up my 3rd round as of tomorrow! 3 down, 2 to go. This promotion is working well for Marriott in my case. I would probably be staying on my HH Diamond status otherwise - but since HH has no recent promotions...