Hello,
Are you using an address verification plugin? I have tested this in a fresh WooCommerce installation and I could not reproduce the same issue – the postcode field allows numbers and two letters with space in between.
Link to image: https://snipboard.io/rdT8nE.jpg
That said, could you please share a copy of your site’s System Status? You can find it via WooCommerce > Status. Select “Get system report” and then “Copy for support”. Once you’ve done that, paste it here in your response.
Hi @trischan
We’ve not heard back from you in a while, so I’m marking this thread as resolved. Hopefully, you were able to find a solution to your problem! If you have further questions, please feel free to open a new topic.