Hi @EvanARitt
Please ensure you have configured Shopify Flat Rates (or) Carrier rates under the shipping zones for these countries.
If you’ve already cross-checked Points 4, 5, and 6 in the troubleshooting steps provided by @Mirdas , then I recommend reaching out to the Shopify support team or the relevant third-party app support (if you’re using any), as it may require further debugging from the tech support team to resolve the issue.