I used a (gifted) EEO BOGO last weekend with an already booked (GRB) rate in SF. Called elite services the day before to confirm that it would be valid. The CSR read through the T&Cs with me, okay'd it and said she put a note in the rez.

At check-in, the front desk agent pored over the cert (numerous times it was almost comical), was unsure if the hotel participated, excused himself to check with a manager, came back to say they did not, but were going to make an exception. Of course, I explained that I'd confirmed with MR CSR by phone.

Got up to my room and minutes later the fd agent called to say it was indeed a participating hotel and all was fine.

Give MR a call. Good luck!