Hello there, s.perseo.
I work with the Epic Player Support team and was responsible for the creation of the release form you’re having trouble with. I would love to talk in greater detail about the issues your getting and help resolve them. Would you mind shooting an email to help@epicgames.com with the subject line: Attention: Rich W.
In that email please include a screenshot of the error and your address. This will help me troubleshoot the form and get it functioning for you and anyone else that may experience this issue.