Reminder: Account Migration has NOT begun. You will receive notification in Minecraft Launcher or on http://Minecraft.net/profile when it’s your turn. Do not share info on any site until you've received notification via launcher. We will NEVER ask for personal information via email.
We apologize for the inconvenience, but this is currently a known issue. The team is currently working on a fix that should fix the issue as soon as possible. Thank you for your patience while we work on the solution! ^TK