Greetings,
I have discovered last night that you can fully manage your Hubitat via Internet, if you own an Amplifi HD router. All you need to do is use the free app Teleport that allow you to VPN to your router. As soon as you activate Teleport on your Smartphone from anywhere in the world, it's like if that phone is now part of your local home network.
All you have to do next is to go to your Hubitat app settings, Select Hub, choose the one connected to a Amplifi HD router, then click on the Tools icon at the bottom of your screen and select Hub WebUI to fully manage your Hubitat.
Cheers !
Cyberjo