[fyllepo]

Looking through the WooCommerce documentation you may want to try using the woocommerce_checkout_fields filter instead of woocommerce_default_address_fields

Seems more logical as the fields above aren’t all address related, and that hook derived from class-wc-countries.php.

Also, note the field names are different based on the context of the page, for example, the billing page fields are named as so:

• billing_first_name
• billing_last_name
• billing_email
• billing_phone

Hope that helps! Good luck.

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