使用Azure AD B2C的Xamarin.Forms应用仅显示Microsoft登录

Question

I'm developing a Xamarin app that uses Azure AD B2C and I'm having some trouble.

Even though I have LinkedIn, Google, Microsoft, Facebook, and Twitter setup as Identity Providers, the only thing I am ever prompted for is my Microsoft account. I don't see any of the other buttons when my app invokes the login. Works great for Microsoft login, can't access any of the others.

Here is my call to AcquireTokenAsync:

var result = await AuthenticationClient.AcquireTokenAsync(Constants.Scopes, 
    GetUserByPolicy(App.AuthenticationClient.Users, Constants.PolicySignUpSignIn), 
    Evaluator.App.UiParent);

In the Azure AD B2C settings in the portal, I have Web App / Web API set to NO, Native client set to YES. The Custom Redirect URI is “masl{myappid}://auth”.
Under Keys it says “No results”. Under API access (Preview) it says there are 2 scopes (both checkboxes checked for openid and offline_access). Under published scopes (Preview) it says Web app / Web API has not been included.

Under Identity providers, I have LinkedIn, Google, Microsoft, Facebook, and Twitter configured.

Answer 1

It turns out that changing to use one of the other overloads of AcquireTokenAsync causes different behavior.

var result = //await AuthenticationClient.AcquireTokenAsync(Constants.Scopes, GetUserByPolicy(App.AuthenticationClient.Users, Constants.PolicySignUpSignIn), Evaluator.App.UiParent);
    await App.AuthenticationClient.AcquireTokenAsync(Constants.Scopes, GetUserByPolicy(App.AuthenticationClient.Users, Constants.PolicySignUpSignIn), UIBehavior.SelectAccount, string.Empty, null, Constants.Authority, App.UiParent);

The original call caused the Azure AD service to be called, and the call shown here causes the Azure B2C service to be called instead. I don't see that documented anywhere, and I wish all the overloads had better documentation describing the relevance and distinctions in behavior between them.

Now I see all the providers I had configured showing up as options! However, there's a new problem in that (despite the fact that they appear to be configured correctly) I no longer get an email address back in the result.User.DisplayableId field. Despite this, my original question is answered.

Answer 2

Configure your Policy Identity Providers (IDPs)

Sample Policy