Hello, @amirehmarwan

If you’ve added/copied the .ssh folder into the non root user’s home directory as mentioned in the article:

cp -r ~/.ssh /home/sammy
chown -R sammy:sammy /home/sammy/.ssh

This should work fine. However you can try to ssh by adding -vvv to your ssh command in order to get/receive a more verbose output, e.g:

ssh -vvv user@DropletIP

The provided output should help you to find out why the connection is failing and then we can further troubleshoot the connectivity issue.

Let me know how it goes.

Regards,
Alex