Workbench Access field cannot be used for access control
The fields were enabled all along, the main issue was targeting the problem.  Only my body field was displaying on the node draft. I had several other custom content fields in the node but they weren't displaying in the Draft.  The site is built using Context and Views so was I had to do was clone Draft versions of those View Blocks and View Blocks.  Setting that up can be a little confusing but I found good documentation here

Draft Revision Blocks