After following all the instructions of Github in here and here step-by-step to add SSH key to my account and access it via SSH connection I am still hitting the following error:
ssh -T (my-user-name)@github.com
Permission denied (publickey)
I have also tried the step-by-step debugging of github and also this Stackoverflow thread. Yet all dead-end for me. I am operating on a Mac OS Catalina 10.15.5. Do I miss any step in between?