Account Migration has not begun. There will be an in game message when it's your turn to move. Do not fall for any third party websites that are telling you to migrate NOW. They're trying to steal your information.

My old email which I use to setup my account has been deleted and can not be retrieve. Thus I'm not able to login to my MineCraft Java. When I try to update my Majang account information, it said that I need to secure it first, but the instruction is sent to my old email.