Can someone from ebay explain to me why it's so hard to enter a tax ID for buying products from outside the EU? Where can I enter the tax ID?

I set up a business account. I want to buy a computer on eBay imported from the UK. Where can I enter the VAT NIP? | For Buyers

I set up a business account. I want to buy a computer on eBay imported from the UK. Where can I enter the VAT NIP? | For Buyers | eBay Poland