I just always have a copy of rate rules with me. If it does not state 'id required at check-in' then I see it as a publicly available rate. Membership in MR is publicly available to all guests of Marriott and requires no payment for membership. Who then using a PP/BB would not be a member of MR?

Why cant they just add a line to all rate rules that states 'use of BB/PP allowed' . Would solve all of this wasted time in knowing which rates work.

I have used dozens of them with M11 rates.