Open Global Protect app on the iPad.
Tap on three lines in the top left corner and go to settings.
Under Portal, type in address as clientvpn.centfs.com
Then enter your computer login username and password.
Then Tap to connect.
Prerequisite : You will need DUO app setup on your phone before you connect to VPN. For DUO setup, send an email to IT.Support@centfs.com