Welcome to the Community!
My apologies for the service disruption. Based on the test results that I have, it seems that your NBN Arris box is currently offline. Can you confirm the status of the lights on the NBN box?
I have escalated this issue to our Engineering Team since after rerunning some tests, we can definitely say that this is a fault that NBNCo needs to investigate on. You will be provided updates regarding this case by one of our Engineers via SMS or phone call.
If you have queries or other concerns, just leave a comment.