cant login - problems on 4 May 2018

Unfortunately according to the ToS the original owner of an account does not have the right to choose what they do with that account. They cannot sell it or otherwise transfer it. If an account is fully transferred and a new player controlling it goes to Origin.com to change the email then no-one would any the wiser. However, what seems to have happened is that many have not transferred full control as they have neglected to set their own email/password, memorable answer and two factor authentication.