FortiClient : Show VPN before logo dosent work

Hi everyone,

I set the option "show_vpn_before_logon" in my FortiClient EMS. I do a config backup on my client and if I edited the conf file I can seen the flag : 

<show_vpn_before_logon>1</show_vpn_before_logon>

But when I rebooted my computer, noting in login screen ! I used the last verion of FortiClient (7.0.5). 

Is it a bug or something is missing in my configuration ?

Thanks