Welcome to TPG Community!
We were able to locate your account using your community details and tested the line, but was not able to detect any fault within the NBN network.
The NBN ARRIS NTD box shows that it's been stable, however, the modem is not communicating to it.
Could you check if the modem is properly connected to the NBN NTD box? Are you able to send us a picture with the setup and the light status of the modem/router?
Thank you @priyankawalder2
The yellow cable (Ethernet cable) connected on the back of the NBN Arris box. Is it connected to the WAN (Blue) port or to the LAN (Yellow) port of the modem/router?
What are the troubleshooting that you've done so far?