Confirm whether GitHub Advanced Security is enabled
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On your GitHub Enterprise Server instance, navigate to the main page of the repository. 
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.  
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In the "Security" section of the sidebar, click Code security and analysis. 
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Scroll down to "GitHub Advanced Security." 
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If there is an associated and active Enable button, GitHub Advanced Security is available for this repository but not yet enabled. 
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If use of GitHub Advanced Security is blocked by a policy, the Enable button is inactive and the owner of the policy is listed.  
Requesting access to GitHub Advanced Security
- In the "GitHub Advanced Security" settings, click the enterprise name to display a list of users with access to edit the policy that controls access to GitHub Advanced Security. For more information, see "Enforcing policies for code security and analysis for your enterprise."
- Follow your company's policy for requesting access to additional features.
Enabling GitHub Advanced Security
- In the "GitHub Advanced Security" settings, click Enable.
- Rerun code scanning.