Hi Drew,

Thanks for sharing your question with the Klaviyo Community.
The issue is typically due to the Klaviyo onsite.js script being loaded with the defer attribute. This causes the klaviyo.init() and klaviyo.enable() calls to run before the Klaviyo script has fully loaded.

The simplest fix is to remove the defer attribute. Removing defer will make the browser load and execute onsite.js as soon as it’s encountered in the HTML. This ensures the Klaviyo object is ready before your inline script tries to use it:

<script src="https://a.klaviyo.com/media/js/onsite/onsite.js"></script>

Thanks, and have a great rest of your day!