Has anyone used or done this? I go to Spain in a fortnight and believe that this is now a requirement to enter and exit Schengen countries, since the UK left the EU and showed the EU what's what, yeah right....
Not personally, I've only read that there are problems... The attached article says that the EES will only begin on April 10th for air travelers, as the systems at the channel ports is not working. https://www.bbc.co.uk/news/articles/c33l77k88vyo