I created an organization on GitHub and I'm the owner of it. I created a repo into this organization, initialized with a Readme. I cloned it with ssh without any problem. I made some changes to commit, and when I tried to push to remote origin :
$ git push
ERROR: Permission to Organization/repo.git denied to EtienneWan.
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
$ ssh -T git@github.com
Hi EtienneWan! You've successfully authenticated, but GitHub does not provide shell access.
I'm the owner of my organization, so I don't understand why I can't push when I cloned without problems.
EDIT: I cloned with git@github.com:Organization/repo.git
2nd EDIT: The key I was using was added by a GitHub app. Check my answer, I resolved my problem.