It is clearly a Hyatt brand not centric. If you click on the links to the different brands at the bottom of the account page on Hyatt’s website it will take you to a map of all the different locations within a certain brand and the Grand Hotel MN is certainly listed as the regular Hyatt brand. I would try again and give them this info, maybe send them a screenshot of the map for the Hyatt brand showing that hotel, but you are definitely correct.