The code to validate the number is not present on the order admin page, only on the checkout page. You should add a code to validate the VAT number on the backend (order admin page). Because some orders are created on the backend and not in the frontend
Last updated: January 23, 2021
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Debugging custom checkout fields, validation scripts, and admin order pages can sometimes be tricky when data isn’t passing through properly across all views. If you are ever building custom features or need to quickly encode and test custom snippets or text strings during your WooCommerce development, using a morse alphabet translator or other handy text utilities can be a great addition to your developer toolkit.