Plesk 12.x / Linux :: Antivirus Not Enabled When Using CLI

when trying to add several useraccounts to our mail domain using the cli, we have a problem enabling the antivirus. We add user with the following CLI command, the antivirus flag is set. /usr/local/psa/bin/mail --create mail@mail.box -mailbox true -antivirus inout -passwd yourpassword -cp-access true

But when we got to the web interface and select the newly created user, the antivirus is still disabled for him and has to be enabled manually. Is this a known problem? Or is there any other way to automatically enable antivirus than using the "-antivirus" flag? Because we 're talking about more than 100 users it would take a lot of time enabling the AV manually for each of them.We 're running 12.0.18 Update Nr. 29