Shippo not working correctly

Hey all. Just putting the finishing touches on the website, and we activated the Shippo integration. Unfortunately, it doesn’t seem to work. It doesn’t recognize when an address has been entered into the ‘Shipping Address’ form block. It just displays the message saying there are no couriers available. I’m not sure where I could be going wrong.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)