Enable Access Requests in the SharePoint Site Collections

Enable Access Requests in the SharePoint Site Collection (Allow requests for access):

Scenario:

You are a SharePoint Administrator for XYZ Company. You are maintaining Many Share Point Sites in the SP portal.
You created many sites as per the Business requirement based on the Departments in the Organization.

Example:

Https://server/sites/HR/
Https://server/sites/IT/
Https://server/sites/Sales/
Https://server/sites/Marketing/

Each Site collection will be having one Primary Administrator and Secondary Administrator. These people should take care all the access requests for the particular Site.
In this Scenario the SharePoint Administrator will Enable the Access Requests with the Primary and Secondary Administrators Details i.e Email ids

Navigation Path: Site >Site Settings > Permissions
Under Permissions > Settings > Access Requests

or
Hint: Direct Access Request Page: Https://server/sites/IT/_layouts/setrqacc.aspx