After an initial install of Password Manager, users may not have permission to access the PMAdmin website.
To grant permissions to a user account for gaining access to the PMAdmin website,
1. Simply add the user account to the PMAdmin local group on the Server where the Password Manager Administrator site is installed.
2. Add the user account to the IIS_IUSRS group also.
Please review the Password Manager How-To-Guide for additional details for minimum account permissions: Here.