No Points for Dining When Using Gift Cards
From the Terms and Conditions section "Earning Hyatt Gold Passport Points As A Non-Registered Guest":
"Eligible Methods of Payment” include cash, check, or major credit cards or debit/bank cards. "Ineligible Methods of Payment" may include but are not limited to hotel House Accounts, charges settled by a company or organization, Hyatt Gold Passport dining and spa awards, room charges, Hyatt-branded gift cards, Hyatt gift cheques, or hotel-specific gift card/certificates.
I specifically traveled to a local Hyatt restaurant to dine so that I could keep my Gold Passport account active. I used a Hyatt gift card to pay. Since my points had not posted, I looked in T&Cs to see if there were any exceptions (obviously should have done this first), and found the above. Who would have thought you couldn't get points by using a Hyatt gift card, which most would consider the same as cash??