No Security Settings available under Approval Required in Customer Notifications

[Drishti Maharaj]

Hi there,

We are currently on Jira Project Management Software (v8.5.1) and I am trying to find the "security settings" that should be available under "approval required" in "customer notifications" but it is not visible. 

Is this only limited to cloud or specific versions of server?

If anyone can please advise?

Thanks.