Azure Active Directory Auth with ASP.NET Core 6 MVC

I created the whole process to use user authentication in my ASP.NET Core 6 MVC application, through Azure Active Directory. I'm using the Microsoft.Identity.Web API for this.

I can open the login screen, log in, but the callback (CallbackPath) is failing.

Here are parts of code and result with error after login:

Startup.cs

foreach (var conn in azureADTenants) 
{
    services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)
       .AddMicrosoftIdentityWebApp(options =>
       {
           options.Instance = conn.ActiveDirectorySettings.Instance;
           options.Domain = conn.ActiveDirectorySettings.Domain;
           options.TenantId = conn.ActiveDirectorySettings.TenantId;
           options.ClientId = conn.ActiveDirectorySettings.ClientId;
           options.ClientSecret = conn.ActiveDirectorySettings.ClientSecret;
           options.CallbackPath = conn.ActiveDirectorySettings.CallbackPath;
           options.SignedOutCallbackPath = conn.ActiveDirectorySettings.SignedOutCallbackPath;
       });

    services.Configure<OpenIdConnectOptions>(conn.Name, options =>
    {
        var existingOnTokenValidatedHandler = options.Events.OnTokenValidated;
        options.Events.OnTokenValidated = async context =>
        {
            await existingOnTokenValidatedHandler(context);
            await context.HttpContext.SignInAsync(
                CookieAuthenticationDefaults.AuthenticationScheme,
                context.Principal);
        };
    });
}

appSettings.json

"ActiveDirectorySettings": {
    "Instance": "https://login.microsoftonline.com/",
    "Domain": "aaahotmail.onmicrosoft.com",
    "TenantId": "xxxxxxxx-xxx...",
    "ClientId": "xxxxxxxx-xxx...",
    "ClientSecret": "asasasasasas",
    "CallbackPath": "/Login/signin-oidc",
    "SignedOutCallbackPath": "/Login/signout-oidc"
}

In the Azure portal, in the redirect URIs section I entered:

https://localhost:81/Login/signin-oidc

In my controller class I added the redirect action

[Authorize]
[ActionName("signin-oidc")]
public IActionResult SignInRedirectFromActiveDirectory()
{
    return null;
}

But I'm getting it in return:

So, what in practice do I need to do more to have login redirection in my controller (LoginController)?

Thank you very much in advance for your help!

I got something to no longer receive the error I mentioned.

The system still doesn't redirect to my controller, but passes authentication in AD and then returns to my login controller (where I originally called /Login/Index).

In startup.cs i added the following:

Ref: https://www.youtube.com/watch?v=S_xDAB_s-GM&list=WL&index=3

Thank you for your help