I have completed task correctly but still it's failing

I have completed task no 21 correctly in challenge of 100 days of cloud in Azure but still it’s failing. And also lab is not loading, after clicking on start it remain blank with black screen.

So:

  • What was the error you got?
  • What did you do to accomplish the task?

The most common thing people get wrong with this task is how they set up the keypair. You want the grader to be able to find the key, so it should be at the default place: /root/.ssh/id_rsa. You can do this by using ssh-keygen with no arguments – it will give you the appropriate default.