The default setting for notifications is to not communicate information regarding hidden agents.
We see below the default setting during notification creation:
Users normally make a separate notification category for hidden agent notifications, for the rare instances where that is desired. We recommend these notifications have different destination email aliases and possibly interval of notification.
If an existing notification requires notification of both hidden and non-hidden agents, travel to the Security Notifications page.
Scroll right on the grid until you see the Send Alerts for Hidden Agents column, then toggle the slider.
The change will take effect immediately.