Please use the below steps to provide a user with the HR BP Permission:
Step 1 : Remove them as Site Admin
Step 2 : Add as HR Manager with Specific employee
Step 3 : Create an HR Permission with Limited capabilities and assign it them
Step 4: Assign the newly created permission
Note:
- Need to remove the Users as site admin and add them as HR Managers
- Assign it with Limited HR Permission (Limited HR permission will restrict their access only to those user reviews/feedback for whom they have been added as HR managers)