If your IT department has enabled it, the most "portable" way is to avoid the app entirely. Open your browser. Navigate to your company's VPN URL. Log in via the web interface.
@echo off echo Connecting to Office VPN... cd /d "%~dp0Fortinet\FortiClient" FortiSSLVPN_cli.exe --server vpn.yourcompany.com --port 443 --username %1 --password %2 --vpnmode ssl