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Hi @haider73
Welcome to the Community!
For NBN HFC service, you need an NBN-compatible VDSL2 modem which allows VLAN tagging. What specific model are you using? From what I can tell, there are different models for the TP-Link N600.
Regards,
Hi @haider73,
Yes, If you switch from ADSL2+ to TPG NBN you need to use the original TPG Username and Password.
You may find this thread helpful on how to setup your 3rd party modem/router.
Let us know how it will go and should you require further assistance.
Cheers!