So your agent status command has proven that the agent installation was (seemingly) a success?
Linked to: cloud.tenable.com:443
Link status: Connected to cloud.tenable.com:443
But your internal system is still showing as unresponsive? Not to worry, there's a handful of reasons why this might be happening and hopefully this article will help you identify which one applies to you.
The machine is switched off
It would be worth rebooting the machine and running the scan again
There is a problem with the network connection
Have you checked that the internet is working and there aren't any 'power management' settings enabled anywhere? To test this, open your browser and type: https://cloud.tenable.com
The agent is not installed correctly
At this point it's probably worth starting over: