Create User Group in FortiGate (Required for FortiOS versions prior to 6.2)

UI: User & Device > User Groups

Create a User Group for each of the imported FortiNAC groups that pertain to VPN (configured to map to the VPN logical network choice). These groups will be used within the FortiGate firewall policies that grant network access to VPN clients.

Proceed to Create FortiGate Firewall Policies.