Getting permission denied (public key) on gitlab

My problem is that I can't push or fetch from GitLab. However, I can clone (via HTTP or via SSH). I get this error when I try to push : > Permission denied (publickey) fatal : Could not read from remote repository From all the threads I've looked, here is what I have done : - Set up an SSH key on my computer and added the public key to GitLab - Done the config --global for username and email - Cloned via SSH and via HTTP to check if it would resolve the issue - Done the ssh -T git@gitlab.com command If you have any insight about how to resolve my issue, it would be greatly appreciated.