Hi @NikitaMaree14 . The ethernet cable from the NBN box goes to the Internet port on the Orbi.
The internet config settings are PPPoE, your username with @tpg.com.au on the end and your account password. You know about the VLAN ID but in the manual there are two ways of setting it for different purposes which I am unsure on.
What is the colour of the Router LED on the front?
There are 2 more settings which may be default anyhow.
@NikitaMaree14 . There is still the vlan id setting. Although if you were able to set a value 2, it must be the right section.
Compare the MTU setting between the huawei and orbi.
Is there anything on the orbi system log?