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Hi @jkcperez24,
You may need to connect with PPPoE by going to your modem's settings. You can check out the guide from TP Link.
The username and password will be your TPG Username/Password.
Hi @jkcperez24 .
The AX73 has to be in Wireless Router Mode. Go to Advanced > System > Operation Mode.
If you are on FTTP or Data Only plan, skip the following.
If you are on a Bundled NBN/VOIP plan (even if you don't use the phone), you need to set VLAN ID=2 for Internet and 0 for priority. Check setting on VX420.
This iiNet article has the setup for Archer C9 which is similar to (not quite the same as) the AX73.