I see that other people on this forum have got the Unifi USG working with TPG NBN FTTN. I was not able to get it to to work, note I was using the USG to handle PPPoE auth with the ADSL 2+ connection which preceeded the NBN upgrade.
Quick rundown of what I tried:
1) Put the TP-LINK Archer VR1600v Bridge Mode in line with this guide - https://community.tpg.com.au/t5/NBN-Installation/Setup-bridge-on-TP-LINK-Archer-VR1600v-then-replace...
2) Unifi Setup is as per the attached images - PPPoE / VLAN ID = 2 / TPG username and password (same as web portal access / MSS Clamping - Custom 1452 (highest possible).
Any assistance would be greately appreciated. Thank you.
TPG does no provide support for third party devices, however, I may advice you to check the ui forum.
Your device may not compatible with NBN VDSL2.
You can set up TPG as bdige and try if suits.