In order to add your new GitHub organisation, you will need to delete the oAuth app from GitHub and then re-authorise with our integration.
Step 1: Revoke the Snyk permissions on GitHub
Note: You do not need to revoke the 'Snyk Login' application
Step 2: Re-connect GitHub on Snyk.io
If you can not find a repository that you are expecting to see, take a look at the Why is my GitHub repo not showing up? article to help you troubleshoot.