var resetCode = WebUtility.UrlEncode(await _userManager.GeneratePasswordResetTokenAsync(user));
    var callbackUrl = Url.Action("ResetPassword", "Account", new { userId = user.Id, code = resetCode }, protocol: HttpContext.Request.Scheme);

var resetCode =WebUtility.UrlDecode(model.Code);
    var result = await _userManager.ResetPasswordAsync(user, resetCode , model.Password);