Thanks so much for your reply @Kyle-Robin and for looking further into this using the above resources.
I understand that you do not plan to trade outside of the Netherlands at this time, however as your business is located within the EU we do require you to declare your VAT number (or state that you do not yet have one using N/A as a placeholder) for us to be able to correctly issue your invoice. At present, merchants based in the Netherlands will see this marked on their invoices as 0% VAT, however we do still need to keep track of this, in accordance with EU law.
I have confirmed that you do not need to place the NL in front of your VAT number, as this will be pulled from the address of your store automatically. Though if this is still not working for you, I would then encourage you to reach out to your local tax authority to confirm your ID, or if possible to look into getting a new ID issued.
I hope this helps!
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