microsoft-authentication-library-for-dotnet: AcquireTokenInteractive for AD B2C on .NET Core 3.0 WPF desktop client does not work

Which Version of MSAL are you using ? MSAL 4.0.0

Platform .NET Core 3.0

What authentication flow has the issue?

• Desktop / Mobile
  • Interactive
  • Integrated Windows Auth
  • Username Password
  • Device code flow (browserless)
• Web App
  • Authorization code
  • OBO
• Web API
  • OBO

Is this a new or existing app? This is a new app

Repro

// Creation of PublicClientApp
// Call to WithRedirectUri is commented out because that redirect URI cannot
// be added during app registration. 
public static IPublicClientApplication PublicClientApp { get; } = PublicClientApplicationBuilder.
    Create(ClientId).
    WithB2CAuthority(Authority).
    // WithRedirectUri("http://localhost").
    Build();

// ...

// Sign-in method logic
await App.PublicClientApp.AcquireTokenInteractive(App.ApiScopes).
    WithB2CAuthority(App.Authority).
    WithPrompt(Prompt.SelectAccount).
    ExecuteAsync();

Expected behavior Call to AcquireTokenInteractive should open default browser and prompt user for login credentials. After login should return focus to app.

Actual behavior AcquireTokenInteractive is throwing an exception: “Only loopback redirect uri is supported, but urn:ietf:wg:oauth:2.0:oob was found. Configure http://localhost or http://localhost:port both during app registration and when you create the PublicClientApplication object. See https://aka.ms/msal-net-os-browser for details”.

Additional context/ Logs / Screenshots Here is the Azure portal AD B2C tenant app registration screen for native client: link

On the AD B2C app registration I cannot add custom URI “http://localhost”.

So how can a .NET Core Desktop WPF app use interactive login with B2C? Are there any other options and examples?