They want a minimum 7-character login, and first & last name-- then it seems you can't just type your desired actual address's name@mailfence.com, instead you have to select from a short list of varied combinations of login, first, last. I just changed my first name to the short name I wanted and went back to that list, and as expected, it appeared as an option. I picked it, I restored my real name, everything is OK AFAICT. Still, I wish vivaldi.net and mail.com would get on the 2FA train... especially the former.