ASP.NET Core Identity: Can't Access Authorized Page After Authentication

[sachinkumarrajak]

I'm encountering an issue with my ASP.NET Core application's authentication and authorization setup. I have a protected page that requires users to be authenticated to access it. I've followed the standard practices for setting up ASP.NET Core Identity, but even after successfully logging in, I can't seem to access the protected page.

In my view page there are two login buttons "LoginwithIdentity" and "LoginWithSSOID" .here i am able to access "
authorize page by "LoginwithIdentity" but not able to access by "LoginWithSSOID" .

here the sample code that i have tried for both buttons
"LoginwithIdentity"

[HttpPost]
[AllowAnonymous]
public async Task Login(LoginViewModel model)
{
if (ModelState.IsValid)
{
var result = await signInManager.PasswordSignInAsync(
model.Email, model.Password, model.RememberMe, false);

            if (result.Succeeded)
            {
                return RedirectToAction("Index", "Category", new { area = "Admin" });
            }

            ModelState.AddModelError(string.Empty, "Invalid Login Attempt");
        }

        return View(model);
    }

"LoginWithSSOID"
var userName = "hardcodeduser"; // Replace with an actual username
var claims = new List
{
new Claim(ClaimTypes.Name, userName),
// Add other claims if needed
};

        var identity = new ClaimsIdentity(claims, "custom");
        var principal = new ClaimsPrincipal(identity);

        // Sign the user in
        await HttpContext.SignInAsync(principal);

        // Redirect to the protected view page
        return RedirectToAction("Index", "Category", new { area = "Admin" });

page that i want to access

[Area("Admin")]
[Authorize]
public class CategoryController : Controller
{
private readonly IUnitOfWork _unitOfWork;

    public CategoryController(IUnitOfWork unitOfWork)
    {
        _unitOfWork = unitOfWork;
    }

    public IActionResult Index()
    {

        IEnumerable<Category> objCategoryList = _unitOfWork.Category.GetAll();
        return View(objCategoryList);
    }
}

this page i am not able to access using LoginWithSSOID