Every site comes with two keys. The test key starts with site_test_ and only answers on localhost, inside your app on your own computer. On any real domain it is refused, by design, so a test key that ends up in production serves nothing.
On your website, use the live key, which starts with site_live_. It is under Keys and API on your site in the dashboard, and in the script tag the Overview gives you for going live.
The live key on your website
<script src="https://api.askverb.com/v1/verb.js"
data-verb-site="site_live_..." defer></script>