If you get the error “License activation is not authorized for …” when trying to activate your license, you are using the “Restrict Sites” function that prevents your license for being activated on any website you have not allowed.
To enable your website go to your account on wpsecurityninja.com/account/
Click on “Licenses” and choose the appropriate Security Ninja license
Scroll down to the “Restrict Sites” button
This will open a window where you can see the sites you have already whitelisted (if any) and also a button where you can add a new site “Whitelist site”
Here you can add a new website to allow your license to be activated.
You are now able to activate your license.