Hi, I also had a TPLink modem router and I only had to change the device to work as a router only. Then I used the same method described here, using ACCusername twice. I think some devices are not compatible with AGL. This link shows how they configure it for a different provider, check if the method works for you. But make sure to use your AGL details. https://www.letsbemates.com.au/mate/guide-huawei-hg659-modem-nbn-fttn/