Task failed: Linux SSH Authentication

The task was to create ssh passwordless authentication for ‘thor’ user to the app servers. I did the following:

ssh-keygen -t rsa
ssh-copy-id stapp01
ssh-copy-id stapp02
ssh-copy-id stapp03

I was then able to ssh to stapp01, stapp02 and stapp03 without a password.

Nevertheless, the task failed. Can you explain why.

Thank you.

(I see that I am not the only one that had this problem. There are topics from 8d ago, 9d ago, Apr 8, and Mar 11 which express the same issue. I will look at these topics to see if I missed something.)

SSH passwordless authentication task about ssh without password in respective server sudoers user not thor user. Task was a bit complicate but you have to understand their requirements.
for demo :—
ssh-copy-id [email protected]
ssh [email protected]
[email protected] :# ls -l

like this.