web self service notifications

I have setup the;

(1) Workflow Approver Management, Aprover Group - Leave_Finance - Approvers (Entity 4)  Role (mandatory) 

(2) Setup the Process Definition, Leave_Finance Content (Process), Step Definition Approver Group(Leave_Finance) 

(3) Linked the Process Definition, LEAVE_FINANCE, Hierarchy (Accounts_Dep.), Linked to Employees (1,2,3,4) 

The Approver cannot see the notification in his web self service anytime an employee process a leave request on ESS. What am I missing?