I have a client requirement to route the ContractClauseApproval based on security role

I have a client requirement to route the ContractClauseApproval based on if the task owner (user submitting the task) has a particular security role. If they have the security role it goes to approval group A if they do not it goes to approval group B. I have been unable to get workflow to route using either of the following two criteria: Task.ownerRoleDisplayName.toUpperCase() or Task.ownerRole.toUpperCase()