If activation fails with License activation is not authorized for …, the license has Restrict Sites enabled. Only whitelisted sites can activate.
- Open wpsecurityninja.com/account/.
- Click Licenses and open the relevant WP Security Ninja license.
- Scroll to Restrict Sites.
- In the window, review existing whitelisted sites and click Whitelist site.
- Enter the site URL and save.
You can activate the license on that site afterward.
More background: Whitelist sites.



