When are the Global Protect Portal and Gateway Licenses Required?

If you want to use GlobalProtect to provide a secure remote access or virtual private network (VPN) solution via single or multiple internal/external gateways, you do not need any GlobalProtect licenses. However, to use some of the more advanced features (such as HIP checks and associated content updates, support for the GlobalProtect mobile app, or IPv6 support) you must purchase an annual GlobalProtect subscription.

This license must be installed on each firewall running a gateway(s) that:

• Performs HIP checks
• Supports the GlobalProtect app for mobile endpoints
• Supports the GlobalProtect app for Linux endpoints
• Provides IPv6 connections
• Split tunnels traffic based on the destination domain, application process name, or HTTP/HTTPS video streaming application.

For GlobalProtect Clientless VPN, you must also install a GlobalProtect subscription on the firewall that hosts the Clientless VPN from the GlobalProtect portal. You also need the 
GlobalProtect Clientless VPN
 dynamic updates to use this feature.

Please visit the GlobalProtect Admin guide for ALL of the detailed information on licensing and how to install the licenses properly.
GlobalProtect Administrator's Guide - About GlobalProtect Licenses

Note:
High Availability deployment of the portal and gateway requires identical licenses to be installed on both the devices.