The test modem request will not push through as the case will be raised to our Engineering team for further investigation.
Further updates will be given as soon as it becomes available.
I am on TPG with NBN and have the same issue. I raised a case with Ubisoft and they advised they cant help me because I am behind a double NAT. The issue started about 2 weeks ago. Before that I had no issues with ubisoft service.
My setup is NBN router->Tp-link Archer router. Tracert shows my 192.168.1.1 going to TPG's router on 10.20.21.123 then out. Thinking I need to move from TPG as I am not in contract.
The IP 10.20.xxx.xxx , although allocated in private IP space is not behind NAT. It is a loopback IP address on our end.
You have a public IP address. The only NAT configuration is on the modem, which is normal. You may configure the port forwarding on the modem for the ports used by the game.