Hi,
Thanks for the PM with working credentials.
I don't know if Nicolas did not update the thread when he manage your message by the contact form ; but it was not working when I tested it two weeks ago.
Well ! Your PM contains valid account, so I was able to access to your website.
The first part is that you can use the HikaShop "zone" in order to create a specific tax zone.
Thanks to it, you can create (or edit) a tax zone, like "Europe" and include all countries that you have to tax.
It will be easier to have one single entry in the listing than every countries.
The other point I see is that, you do not have rule for "company without tax number".
So I think that is the reason of your problem. When a company does not have a valid VAT number, HikaShop won't find any tax rule in your configuration.
So you should add an entry for that companies too.
Kind regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.