Good day @longys1,
Welcome to TPG Community!
We've managed to locate your account using your community details and reviewed the notes. We've seen that our Technical team has extended their help to try to set up your new modem/router, however, it wasn't connecting.
We have a customer who's on the NBN Fixed wireless as well and decided to change their modem to D-link and managed to make it to work. You may visit this link for more information.
We'd like to help you analyze if there's some option that is needed to be changed on your modem. Are you able to post a screenshot of your ADSL/VDSL settings (if I got it correctly) or the page where you can input your TPG username and password?
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