Hello,
The issue you’re experiencing usually occurs when the country field is disabled or removed in either the billing or shipping section. If the country field is disabled, could you please enable the fields and verify from your side?
If you set “I sell to only one country” in WooCommerce settings, that country will appear in the checkout and the country field will be read only and then hide the field by using the below CSS code in the global custom CSS area under theme settings >> custom CSS:
You can hide it with some custom CSS:
#billing_country_field {
display: none;
}
Best Regards.