Welcome to the Community!
I'm sorry to learn about the service disruption. It appears that there was an NBN outage that affected your service. It was raised by NBNCo at 7:13PM AEST yesterday (October 4). The reason for the downtime was due to a local power outage which the power distributor initially gave an ETR of 9PM AEST. However, the power outage wasn't resolved on the ETR provided and it took until 1:45AM AEST (October 5) for the outage to be declared as resolved.
Based on our tests, your modem has regained connection at 1: 32AM AEST (October 5).
If you're still having difficulty going online, let me know so we can look into it further.
When other devices are able to access the Internet through your WiFi, the problem lies with your device and its WiFi adapter.
As a first step, restart your device and see if that fixes the problem. As with the router, network and software problems often get fixed automatically with a simple restart.
If that doesn’t fix your problem, here’s what you can do.