Please ensure that you entered the correct name of your business, and the correct VAT number (including the two letters for the country code at the beginning).
You can also check if it is valid on the VAT site of the European Commission (fill the first two boxes on that page). There you can also double check under which name your business is registered. Please use that as business name when you enter it on our site.
If it shows as invalid on there also, please have a look at this section (or this section in German) to see possible causes.
