Azure Active Directory Sign Up Redirects to Sign In

Question

I am creating a website using ASP.Net Core, and securing it with Azure AD B2C.

I have already implemented signing in and it is all working fine, but now I am attempting to setup sign up and it doesn't seem to be working.

My website setup is based on this sample .

In that example they do not use a sign up policy as they use a shared signup and signin policy (which I would prefer not to), but they do use an edit profile and reset password policy, the API methods can be seen on the SessionController .

I am trying to implement my signup endpoint in the same way like so:

var properties = new AuthenticationProperties() { RedirectUri = "/" };
properties.Items[AzureAdB2COptions.PolicyAuthenticationProperty] = AzureAdB2COptions.SignUpPolicyId;
await HttpContext.Authentication.ChallengeAsync( OpenIdConnectDefaults.AuthenticationScheme, properties, ChallengeBehavior.Unauthorized);

However, when I go here I simply get redirected to the sign in page instead of the sign up page.

The sign up policy and the B2C directory in general is setup correctly as I am using it on another site with no issues.

Can anyone advise what may be causing this?

Answer 1

In my OnRedirectToIdentityProvider method I had:

context.ProtocolMessage.IssuerAddress = context.ProtocolMessage.IssuerAddress.Replace(defaultPolicy, policy);

As the IssuerAddress here is lower case it wasnt finding and changing the policy.

I updated it to:

context.ProtocolMessage.IssuerAddress = context.ProtocolMessage.IssuerAddress.ToLower().Replace(defaultPolicy.ToLower(), policy.ToLower());

As is in the latest version of the sample