Setting permissions for adding outside collaborators

Organization owners, and members with admin privileges for a repository, can invite outside collaborators to work on the repository. You can also restrict outside collaborator invite permissions to only organization owners.

1. In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.
2. Next to the organization, click Settings.
3. In the left sidebar, click Member privileges.
4. Under "Repository invitations", select Allow members to invite outside collaborators to repositories for this organization.
5. Click Save.