Can't connect account - Woocommerce Klaviyo Integration

I am having an issue trying to integrate Klaviyo with WooCommerce on my site. I am using version 3.3.3 of the Klaviyo plugin for WordPress. I go to settings on the plugin, hit connect account, and sometimes it will just take me to the homepage of my website. other times it will ask me to log in to Klaviyo, which I do, then I verify my email, and then it will still redirect me to the homepage of my website. and it doesn’t look like any connection is being made. 

I have tried clearing my cache, as well as uninstalling and reinstalling the plugin. I heard that you need an SSL rating of at least “A” which I do, and my site also has https, so I don’t really have any idea what I could be doing wrong.

Any ideas would be greatly appreciated.