When OAuth App access restrictions are enabled, organization members must request approval from an organization owner before they can authorize an OAuth App that has access to the organization's resources.
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In the top right corner of GitHub, click your profile photo, then click Your organizations.

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Next to the organization, click Settings.

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In the Settings sidebar, click Third-party access.

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Next to the application you'd like to approve, click Review.

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After you review the information about the requested application, click Grant access.
