In order to sync one of your GitBook organizations with a GitHub organization, our GitBook OAuth application needs permissions to access this GitHub organization. Otherwise, it will not be listed.
You can check that the GitBook application is able to access the required GitHub organization by visiting GitBook's authorization page.
If the GitBook application doesn't have access to the GitHub organization, you can either:
After the access has been granted on GitHub, you must update your GitHub Access Token for the GitBook OAuth application.
To do so, simply go to your settings page and click on
Reconnect GitHub Account.