You keep bringing this up and it's simply not true. The EU has a single set of VAT invoice requirements that applies across the EU (the MOSS invoicing standard)

You keep bringing this up and it's simply not true. The EU has a single set of VAT invoice requirements that applies across the EU (the MOSS invoicing standard). Any VAT invoice that satisfies these rules is legal in all EU countries (https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32006L0112 https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32..., article 226). My company does plenty of business with EU businesses and we use a single standard EU VAT invoice without issue.