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In the upper-right corner of GitHub, select your profile photo, then click Your organizations.
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Next to the organization, click Settings.
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In the "Third-party Access" section of the sidebar, click OAuth application policy.
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Next to the application you'd like to disable, click .
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Click Deny access.
Denying access to a previously approved OAuth app for your organization
If an organization no longer requires a previously authorized OAuth app, owners can remove the application's access to the organization's resources.