Facebook with Windows Phone

Is there any current solution to integrate Facebook api on Windows Phone apps? We previously used the plugin Prime31 but they ceased the support for this platform since last August.

Here is in more detail the situation:

I'm trying to use the SocialNetwork plugin to connect my game with facebook on our Windows phone 8.1 game but unfortunately the plugin isn't working properly.

The login system works fine but the graphRequest() and getMe() always return with an error : (error 400 : Bad Request)

I'm doing the following graphrequest:

FacebookPrime.instance.graphRequest("/me?fields=id,name,gender,birthday,email,picture.height(64).width(64)", (error, result) => {});

Do you know what might solve this problem?