Prevent A Specific Domain From Generating Flagged Activity Alerts
Add the site domain as an Allow rule in the Website URLs section of the policy assigned to an OU of users that should no longer generate Flagged Activity alerts when they visit a specified domain.
To apply this change to all users in your organization, add the Allow rule to a policy applied to your root (top-level) OU. If no policy is currently assigned there, create a new policy, add the allow rule to the policy, and assign the policy at root OU.
For more information on allowing and blocking sites in policies, click here.
For more information on how to create and assign policies, click here.