FortiClient VPN and Internet Connection Sharing

Hi,

I'm facing a problem that I have a Windows host which connects to the Fortinet VPN gateway and this host has Internet over VPN and etc. works great.

However now I want this VPN connection "share" with other device , so I choose Network Adapter settings -> Sharing tab > and option Allow other network users to connect through this computer's Internet connection.

But the effect is that it doesn't work !

It works for example with OpenVPN, and there is a config line in there: redirect-gateway def1 which does the job.

Where/How to set it up with FortiClient VPN to make this work ??