A custom IOA rule is not fully functional until its rule group is assigned to a prevention policy . Custom IOAs are created inside rule groups, and those groups must be enabled. However, Falcon applies custom IOA rule groups to endpoints through prevention policies. If the rule and rule group are enabled but not assigned to a prevention policy that applies to the target hosts, the rule will not trigger detections. There is no requirement to manually trigger the rule, and hosts are not individually selected as the primary application method. Host targeting occurs through prevention policy assignment to host groups. The CCFA guide explicitly states that rule and group enablement alone is insufficient without prevention policy assignment.