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In the top right corner of GitHub, click your profile photo, then click Your profile.
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On the left side of your profile page, under "Organizations", click the icon for your organization.
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Under your organization name, 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 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.