Several functions of the Fortinet Firewall use a Radius Server. I decided on FreeRadius. It is installed in Ubuntu 24.04. The Wifi 6 configuration uses it to assign users. IPSec VPNs use Radius server groups.
/etc/freeradius/3.0
clients.conf
This is added in the clients.conf. ipaddr is the Fortinet 61F address that communicates with the Radius Server. secret is the < Your long secret word that IPSec uses >
client my_wifi_ap { ipaddr = xxx.xxx.xxx.xxx secret = < Your long secret word that IPSec uses > shortname = Forti61F require_message_authenticator = no }
Users: I use these users to connect to Wifi 6, IPSec VPN, SSL VPN