> Using the per-app VPN feature, traffic from the Mail, Contacts and Calendars built-in apps will only go through the VPN if the domains match that of the business. Shame that Apple doesn't take this one step further and do it system-wide.
See https://developer.apple.com/business/documentation/Configura... and go to page 95, where it describes the OnDemandRules key for VPN configuration, which supports matching criteria based on domain names, SSID, interface type, and server reachability.
EDIT: I misunderstood. The point is not to get the VPN to auto-connect, but to use the VPN for only certain domains.