So I did the Hyatt Diamond Challenge this October, which meant staying 12 nights at Hyatt properties in two months. I did this, including 2 nights at the Bellagio in Las Vegas, which comes up in booking results for Hyatt hotels on the Hyatt website. Unbelievably, they removed my Diamond challenge status after the challenge period because they claim that the Bellagio doesn't count for the Diamond challenge (as someone who books hotels exclusively online, the fact that it appears bookable on the Hyatt website would seem to mean that it 'counts' as a Hyatt hotel). I called in to Hyatt GoldPassport and they are actually sticking by their decision to remove Diamond status, even though I've continued to stay at Hyatt since completing the challenge and have spent thousands of dollars there this fall. Obviously, I'll be taking my money elsewhere and cancelling the Hyatt card... it's like they don't want my money.