I've just tried to fill in the address and it worked out, whereas country choice is limited to the USA only. I would suggest you to place a test order. By placing a test order, you will make sure your checkout process, inventory, shipping, email notifications, and taxes are all correct. You aren't charged for a test order. Here is the link to the Test Order Manual https://help.shopify.com/en/manual/checkout-settings/test-orders
I hope it will help.
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