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Before using Slim SEO Schema plugin, you need to add your license key in the plugin settings. Go to Settings > Slim SEO and click the License tab, then enter the license key in the input box:

Add license key in Slim SEO Schema

Then click Save Changes to validate the license key. If your license key is valid and your license is active, you can start adding schemas. Otherwise, you'll see a notification in the admin area to update the license key.