Trying to solve a need where in we need to reasonably assure that only members of a group can read the data in an Entity Object ...
Digging around we found similar questions about restricting who can do what with Entity Group can be configured to some degree via policy.
We also saw in the question here https://community.playfab.com/questions/25747/group-roles.html
That this can be set at the title policy level.
What we cant find is any documentaiton on what the policy should look like. The policy we want to set is simply that any member of a group can read and write to that group's EntityObjects but that non members of the group can neither read nore write to the Entity Objects.