Cannot sign up – Duty of Kingdom Review

This game has been very exciting and easy to play. Something I would play everyday, but one problem would be that I cannot sign up. When I register, it asks for my email, and every time I put in my right email, it apparently is incorrect format. So please fix that. And if you can, once I register, my progress is still saved. Thanks a lot! It's a good experience to play this game.
Review by WokWokNation on Duty of Kingdom.