I have noted that currently ADSL2+ modem connected so can you connect your NBN FTTC devices. For that you need to disconnect current ADSL2+ and any other devices connected to any other socket. See below link for FTTC set up, Later let me know status of NBN NCD and Tp link router.
I have done remote test and its showing link is up and passing, its lookalike authentication issue here, I have also reset port remotely.
After connecting router for long time if no authentication detected then you can try manual configuration as below. For that you need to connect your computer or mobile over wireless network or wired connection with TP link router. You can get TP link Wireless name and password from router sticker.
A. Open your browser and in the address bar type http://192.168.1.1 and press Enter.
B. Enter admin for both the username and password and click Login. If you have changed the login credentials, please enter the current username and password for your modem interface.
C. You will see the home screen shown on the right. Click the Advanced tab.
D. On the menu on the left side of the page, click Network to expand the menu and then click EWAN.
E. Enter your TPG Username and Password. Click Save