Can't Generate API Key

I’ve just installed the Sucuri Security plugin on my site. The blue button is not showing on the plugin dashboard. The dashboard General Settings state “Sucuri API Key (not set)” with a “Recover” button. I have not received any emails with an API Key.

Most of the tools in this plugin can be used without a specific configuration, but the core features require an API key to communicate with the Sucuri services. The key is generated using your administrator e-mail and the domain of this site, this will allow you to have access to our free monitoring tool forever even if you remove the API key and generate it again.

https://www.ads-software.com/plugins/sucuri-scanner/