Thanks for the tips, fozziedoggie. (Gotta believe there's a good story behind your handle. But I digress...)
My cert says it's good at any Hampton Inn property so I won't be getting a free night at any fancy resorts but could find it very handy when I need a midweek night somewhere -- probably before an early flight or after a late night arrival. It's good until 2/28/17 so I have plenty of time.
I hope the OP's issue has been resolved.