After adding an "Action" or a "Limit" to a content filtering policy rule, the action or limit does not work after activation.
Actions and limits require SSL interception on the site. If SSL interception is disabled or the site is exempted from SSL interception, actions and limits for the site will not work.
To resolve this issue, you need to enable SSL Interception and make sure that the site is not exempted from SSL Interception.
You can enable and manage SSL Interception exemptions by logging into portal and going to:
Service > Network > SSL Interception