Good morning

Seeking some help with remote access to my Homekit network. 

I have 3 Apple TV's (4, 4HD, 4K) 2 x Homepods and 2 x Homepod minis with one of the Homepods connected as the Hub. 

All are setup in my Home app and all functioning correctly when my iPhone X is on the Wi-Fi network at home.

However as soon as I move off the network and try to access remotely either through cellular or a different wifi network I lose all access.

I have completely rest all of the devices on the network, all are up to date with the latest software versions, cellular data is enabled on my phone and I have followed all of the steps on the Apple website for setting up a Home network. 

I am pretty confident its not the setup as it all works fine until I try and access remotely so i am thinking there must be a setting in the Archer that is blocking me. 

Anyone have any ideas?

Thanks