The cross-border European Union VAT-ID verification can fail at the purchase time in the e-commerce platform due to a wrong VAT-ID syntax. In order to avoid it, you should use, in the check-out, your European Union state code plus your VAT-ID number without any extra character or space, for example, "DE123456789" (without the quotes).
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To contact Acustica Audio support go to the ‘Support and Help-desk Section’ in your Acustica Audio account. We do not provide support via social networks, public forums, Acustica Audio forums, or email accounts.