Announcement:
We have changed the database, previous login credentials will not work. Kindly create a new account by login with Facebook.
The error message 'The user information returned did not contain a username and email address. The OAuth 2 service may be configured incorrectly.' is most likely because your Facebook account was created using a mobile number.
The solution is for you is to first log in to Facebook and add a username and email address there.
Facebook