The app doesn't support multi-storefront and headless stores natively.
So for MSF stores, it will work only for the main store.
Perhaps you can make it work by adding this script into the <head></head> section:
<script async src="https://dmt83xaifx31y.cloudfront.net/public/js/prikidsizecharts.js?v=50#store=STORE_HASH" crossorigin="anonymous"></script>
Replace STORE_HASH by yours store hash.
Please note, that for headless stores it will work only if it will be able to find product ID on the product page.
The easiest way is to put the hidden input field with the product ID somewhere on the page:
<input type="hidden" name="product_id" value="86">
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