I signed up and added my city, I tried to log in and I am still at the sign up again. Telling me to pick my desired kingdom's name; I tried another city and I gotten my username, email and city is associated with an account but I cannot log in.
We updated your username. Seems the medieval kingdom game had your username without the special character above the i. The system may not have been designed to handle that special character.
Give it a try and let us know if you can now login.