I am using Git GUI (or Git CMD) for Windows 10, and have previously pushed a git repository to my GitHub account. That is, I have an SSH key associated with my Git account. Today I am unable to push new changes to that same repository. I receive the error:
Pushing to git@github.com:[username]/[project_name].git
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.