The form is literally impossible to fill out because they've set fields that are inherently optional to be required. I've tried on Firefox and Safari, with the same results.

"This field should only to be filled out by those who have a Visa in their passport, issued by a U.S.Embassy or Consulate." Then don't make it a required field!

I'm trying to give Icelandair a second chance after a 2020 debacle, but it's not going well. How can I trust an airline that can't manage to build a simple online form?