Complete "Atomicorp ModSecurity Rules" key has been installed.
While trying to enable Atomicorp ModSecurity Rules feature under Tools and Settings > Web Application Firewall , a username and password request appears.
Wrong rule set was selected.
Plesk has an opportunity to use Atomic Professional ModSecurity rule set as well as Atomic ModSecurity rule set (subscription) .
Atomic ModSecurity rule set (subscription) should be selected when it is purchased at https://atomicorp.com/ directly.
In case of using additional Plesk License key, Atomic Professional ModSecurity rule set should be selected.