Response via email from the Hyatt Global Centre:
Thank you for contacting Hyatt Gold Passport; I appreciate the
opportunity to assist you.
Please allow me to apologize for any inconvenience this may have caused
you. I have gone to people higher than me and have verified your
question.
Please be advised, any "Eligible stays at Hyatt Hotels as well as at MGM
M-life locations will count towards the Diamond Trial Offer".
Please do not hesitate to contact us if you require any other assistance
with your Hyatt Gold Passport account.