Troubleshooting security configurations
A repository is using advanced setup for code scanning
You cannot attach a security configuration with code scanning enabled to repositories that are using advanced setup for code scanning.
Not enough Advanced Security licenses
If you are on a subscription-based billing model for GHAS, you need available GHAS licenses to enable GHAS features on a private or internal repository.
A feature has disappeared from a security configuration
Changes to your Enterprise Server instance's installation settings by a site administrator may affect which security features are available to your configuration.