Download and install the latest "FortiClient VPN" from the Fortinet downloads page. Scroll down towards the bottom.
https://www.fortinet.com/support/product-downloads
Once installed, open the client and add a new profile.
Connection Name: Sequoyah Main Office
Remote Gateway: Remote.Sequoyah.com
Customize Port: 10443
Check Enable Single Sign On (SSO) for VPN Tunnel
Optionally check "Use External Browser"
DO NOT check "Enable auto-login with Azure active Directory"
Click Save and then click "SAML Login" to connect.
The user or role group must be a member of Sequoyah_VPN group in AD