Make sure the lock is closed in the AV policy for AutoProtect.
Make sure the lock is closed in the AV policy for SONAR (unable to disable PTP)
To disable SEP in task bar, do this,
Go to Clients page
Select a group you want to remove icon for
Under location specific policies and settings, click + sign Location-specific Settings
Click on Tasks next to Client user Interface Control Settings and select Edit Settings
Select the Customize button
Uncheck "Display the notification area icon"
See these as a reference:
https://www.symantec.com/business/support/index?page=content&id=TECH185903
https://www.symantec.com/business/support/index?page=content&id=TECH136678
That should do it