Woocommerce AX country code

I have built a woocommerce store and added different values to the “standard” tax category depending on the country. Now, when I tested the operation in the shopping cart, I noticed that if I put Åland Island as the address, the error message “ERROR: Invalid country code: AX” appears in the shopping cart. And thus I can’t see any mailing options. However, I have set the VAT for all countries in the same way, but Åland gives this notification, even though I put the correct street address, postal code and city. Where is the fault?