EU buyers
If you are an EU business with EU-only shopping preferences, you will need to provide your VAT number, while EORI is not necessary in this case.
If your preferences are set to include the UK, an EORI number is also required, along with your VAT number.
UK buyers
If you are a UK buyer you can proceed with your purchase without VAT and EORI numbers. This applies if your shopping preferences set to UK only or EU.
Be aware VAT will always be charged at checkout.