Can I provide a Virtual address to register for Vat with Amazon?

I’m currently due to register for VAT even though I’m under the 90k threshold. Originally I thought I had a valid uk address to be vat free up until the threshold was reached. However, since I am using a PO Box address, I am unable to provide proof of being uk established for vat purposes (I am based in Ireland). This means I am a NETP. As a result, I have to pay HMRC the owed vat since beginning my seller journey on Amazon. My question is: will I need to provide proof of a physical address to register for Vat or will my virtual address registered with company house do?