For Mezzmo

I'm trying to create an active playlist based on content ratings. My goal is to have a playlist called 'rating' that automatically groups the movies by their content rating (G, PG, etc).

       |- Movie 1 
       |- Movie 2
       |- Movie 3
       |- Movie 4
This does not appear to be working for me. My Keyword Hierarchy only contains 'Content Rating'. My issue is that all the movies are displayed directly under 'Rating'. I've confirmed the metadata for the movies has a content rating.

Has anyone used this successfully or able to confirm my results?