Have been trying to get a claim approved for a newly listed Design hotel - there were a number of websites with lower rates than marriott/spg.com - but was refused twice with different excuses which seemed to be different than the T&Cs, even those that were more specific for this brand.

Was thinking of trying again, but notice the T&Cs have just been updated to:

”Effective December 1, 2018, the Look No Further Best Rest Guarantee does not apply to Design Hotels branded properties.”

Guess I will just book via another website!