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.
Adding an outside collaborator to a private repository will use one of your paid licenses. For more information, see "About billing for your enterprise."
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.
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Next to the organization, click Settings.
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In the left sidebar, click Member privileges.
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Under "Repository invitations", select Allow members to invite outside collaborators to repositories for this organization.
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Click Save.