How to get access token for facebook api when using Azure B2C and .NET Core 2.1

Question

I'm creating a demo application in .NET Core 2.1, which uses Azure AD B2C to login with Facebook, all good there, however, I would like to get the facebook access token to be able to invoke facebook api, I thought it would be added to claims or at least have access to an event like OnAuthorizationCodeReceived, where you would retrieve the access tokens, though so far I see no way to do it. Is there any way to retrieve the facebook access token through azure b2c, if not, what would be the best recommended alternative?

Thanks.

Answer 1

看来现在可以使用Azure B2C作为声明获得身份提供者访问令牌，选中通过用户流将访问令牌传递到您的Azure Active Directory B2C中的应用程序

Answer 2

Currently, an access token from the external identity provider (eg Facebook) can't be passed through Azure AD B2C to your client application, ie this isn't a supported scenario as yet.

The only alternative is to implement a direct federation between your client application and Facebook.