1) Users and Groups -> Roles -> Privileged Access Roles -> Modify Role, search for and select "SAM Target System Manager"
2) Go to the Members tab
3) Edit Member rule so it is:
where ( Admin roles = "SAM Target System Manager" )
4) Edit the Scope Rules, so they are:
Privileged Account Password Policy
Privileged Account Request
5) Press submit, and wait for "Task Completed"
The approver should now see requests in "Manage Privileged Account Requests".
Note: Requests may take a minute or so to appear in "Manage Privileged Account Requests" after they are approved.