c# - Sign-up User Flow with Azure B2C and Microsoft.Identity.Web - Stack Overflow

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I'm using Microsoft.Identity.Web in a .NET 9.0 Blazor server app to support Azure B2C sign up and sign in. I've got it working using a combined Sign up and sign in user flow. This doesn't seem like a great approach if somebody knows they need to sign up and I provide then with a sign up link (I'm afraid that new users might get confused or miss the fact that the sign in page is also where you sign up).

I setup a separate Sign Up user flow. I'm pretty sure Microsoft.Identity.Web doesn't support this out of the box, so I tried to mimic the SignIn action in Microsoft's Account controller, with the only difference being that I pass my SignUp policy name:

[HttpGet("MicrosoftIdentity/Account/SignUp")]
public IActionResult SignUp()
{
    var scheme = OpenIdConnectDefaults.AuthenticationScheme;
    var redirectUrl = Url.Content("~/");

    var properties = new AuthenticationProperties { RedirectUri = redirectUrl };
    properties.Items[Constants.Policy] = "B2C_1_SignUp";
    
    return Challenge(properties, scheme);
}

When I hit the signup route, I ultimately get redirected to MicrosoftIdentity/Account/Error, and get back a 404. I also find this in my Output window:

Microsoft.AspNetCore.Authentication.OpenIdConnect.OpenIdConnectHandler: Error: Message contains error: 'unauthorized_client', error_description: 'AADB2C90057: The provided application is not configured to allow the 'OAuth' Implicit flow.

I've confirmed that my policy name is correct. If I change the policy to my Sign up and sign in policy name, it works.

Is what I'm trying to do possible? What am I missing?

本文标签： cSignup User Flow with Azure B2C and MicrosoftIdentityWebStack Overflow