No virus alert networkshield AEA

In AEA we configured virus alerts, it works for all shields except for the networkshield. ???

How can I turn it on for the networkshield?

modify the group by right click the group then select the properties: Select the Shields then enable network shield or select the Network Shield and enable the check mark.

actually this default have been set on, there is no advance configuration on AEA

The networkshield is enabled, no problems there.
Virus alerting is not working for the network shield, so we don’t get an email when the networkshield finds a threat.
In AEA virus alerting is configured and for all the other shields it works!