Hi @tworzala ,

As all other COE's are inherited from the HR Case COE, I feel that the configuration needs to be corrected. Can you make "Applies to all Child COE" Checkbox as false for all entries and make sure that last 2 Policies shown in image are required. As these will be granting access to WorkForce Admin and Total Rewards COE cases to assignment group as "Benefits COE" Group. 

Please mark my answer as helpful/correct if it resolves your query.

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Nilesh Wahule