@Wrigs79 Login your VR2800 WebGUI - details. Did you set the VR2800 in wireless router mode ? Post some screenshots of VR2800 Network Map menu and describe how did you connect your Telstra modem to...

Since AX90 is a Onemesh capable only router but AX72 is an Easymesh capable here's a post where the user succeeded doing this via WPS method.

@TPBINZA Well, it depends on what's your Internet connection type: These guides are using PPPoE internet connection type. If your ISP is using Dynamic IP then probably you should consult your ISP...

@kodein Keep an eye on this thread for any new RE model which supports Easyemesh via ethernet backhaul.

IMHO this Easymesh configuration should work either via etherneth backhaul through the ISP router (acting as a switch for both AX55s) or it will fall back to a wireless backhaul between AX55s.

@Wrigs79 Try this guide if you have Telstra Smart Modem.