Get online support
Hi @Lyn5
Welcome to the Community!
You may need to check if the 2.4GHz band is enabled or on on your modem/router.
Check if you'll see a button on the modem/router for the 2.4GHz band.
You may also check it via Modem GUI. Use this article as a guide on how to check it: Changing your WiFi password on your TPG Modem
Let us know if you need further assistance.
BasilDV