Repositories owned by an organization can grant more granular access. For more information, see "Access permissions on GitHub Enterprise."
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Ask for the username of the person you're inviting as a collaborator.
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On GitHub Enterprise, navigate to the main page of the repository.
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Under your repository name, click Settings.
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In the left sidebar, click Collaborators.
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Under "Collaborators", start typing the collaborator's username.
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Select the collaborator's username from the drop-down menu.
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Click Add collaborator.
