Each CircleCI account can only be associated with one GitHub account.
Attempts to “Authorize” the connection to a GitHub account that is already linked to a different CircleCI account will result in the following error:
The selected GitHub user or organization is already associated with another CircleCI account.
If this is happening to you and you are sure that your previously-linked CircleCI account is no longer in use, we can help unlink it.
Please respond to this post with your GitHub username, or send a private message to @sebastian-lerner and @Benny. A member of our team will process your request as soon as possible.