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Hi @Mish_Mash . Are all 4 lights lit on the NBN box?
Username and password are the ones for My Account and Post Office, not the admin used to configure the router, nor the ones for wifi connection, nor the ones you use for Community.
Username has @tpg.com.au attached.
This iiNet article describes how to set VLAN ID=2 for a similar Netgear router.
https://help.iinet.net.au/how-set-netgear-nighthawk-rax80-nbn-hfc
Have you tried factory reset and do settings from scratch?
If your plan is BYO router data only plan, or you are on Superfast or Ultrafast, VLAN ID is not used.
Check the router activity log.
Is the Netgear replacing some other router that might still be working? Check VLAN setting in it.
Do you know someone who might have a spare router, any brand?
On the Netgear, what is the Internet light (below power light) doing? Off, On, Blinking?
If you are on bundled NBN/VOIP HFC plan, the router uses VLAN ID=2.
If your plan is BYO router data only plan, or you are on Superfast or Ultrafast (both only available on FTTP and HFC), VLAN ID is not used.
If it is set to 2, leave it as is.
Can you check the Netgear system log.
Select ADVANCED > Administration > Logs.
Copy and paste the text of the log here, or attach pictures of the last two pages.