Why ASP.NET Core MVC 3.1 project wont let me sign in with a register user using Identity

I have scaffolded the Login View to create my own, but the thing is that whenever I tried to Login to the application an invalid login attempt error appears as if it is not finding the user. Cant seem to find a solution to this. Can someone help me please!!!

This is the code I'm using and it was autogenerated:

 var result = await _signInManager.PasswordSignInAsync(user.UserName, Input.Password, Input.RememberMe, lockoutOnFailure: false);                
if (result.Succeeded)
{
   _logger.LogInformation("User logged in.");
   return LocalRedirect(returnUrl);
}
if (result.RequiresTwoFactor)
{
   return RedirectToPage("./LoginWith2fa", new { ReturnUrl = returnUrl, RememberMe = Input.RememberMe });
}
if (result.IsLockedOut)
{
  _logger.LogWarning("User account locked out.");
  return RedirectToPage("./Lockout");
}
else
{
   ModelState.AddModelError(string.Empty, "Invalid login attempt.");
   return Page();
}