This setting does not apply to desktop apps.
A semicolon-separated list of intranet proxy server IP addresses. These addresses are categorized as private by Windows Network Isolation and are accessible to apps that have the Home/Work Networking capability.
If you enable this policy setting, it allows an administrator to configure a set of proxies that provide access to intranet resources.
If you disable or do not configure this policy setting, Windows Network Isolation attempts to discover proxies and configures them as Internet nodes.
This setting should NOT be used to configure Internet proxies.
Example: [3efe:3022::1000]; 126.96.36.199; 188.8.131.52
For more information see: http://go.microsoft.com/fwlink/p/?LinkId=234043