Most of my future reservations say "Suite Night Awards cannot be used for this reservation. Learn more".
Learn more tells me:
"Suite Night Awards cannot be applied to this reservation because there may be not Standard Suites or other premium rooms available during your selected dates, or the hotel may not participate in Suite Night Awards."
Is there a published list of hotels which do (and do not) participate in Suite Night Awards, or can you only find out whether a specific hotel participates after you've made a reservation at it?