Configuring a VPN credential is one of the tasks you must complete when configuring an IPSec VPN tunnel. To learn more, see Configuring an IPSec VPN Tunnel.
To to add VPN credentials:
If you are creating a mobile VPN, select XAUTH.
These entries are the ones you sent to Zscaler beforehand. If you have not already done so, submit your static IP addresses to Zscaler Support, who can then ensure that those IP addresses appear in the menu under Public IP Addresses.