VAT number invalid
I just got an email saying that I must go to Finance > Vat details and add my vat number. My vat number was there originally, but was "lost" after some changes in Booking.
When I click YES, I have a VAT number, and add my VAT number, it says it's not valid. I typed my VAT number here https://ec.europa.eu/taxation_customs/vies/vatResponse.html and it works perfectly.
Specifically it's EL (Greek VAT number), and the VAT number is ***. I've tried to put as input:
*** Everything says to be invalid... I have to do this until 30/5/2020 and no one picks up the phone on booking!
Thanks in advance,