PasswordSignInAsync succeeded always false

Question

I extended the IdentityUser by adding a field and make it as ApplicationUser and use the UserName instead of Email in login using the code below

var result = await _signInManager.PasswordSignInAsync(Input.UserName, Input.Password, Input.RememberMe, lockoutOnFailure: true);

But the problem is result.Succeeded is always equals to False even if I enter the correct UserName and Password..