Facebook login through FirebaseAuth UI fails

Question

I've set up the Firebase Auth UI API in my Android project and Google signin works perfectly, but facebook login always fails, even though I set it up in developers.facebook.com. The error is presented below

E/AuthUI: A sign-in error occurred.
    com.firebase.ui.auth.FirebaseUiException: Developer error
        at com.firebase.ui.auth.util.data.ProviderUtils$1.then(ProviderUtils.java:219)
        at com.firebase.ui.auth.util.data.ProviderUtils$1.then(ProviderUtils.java:195)
        at com.google.android.gms.tasks.zzf.run(Unknown Source)
        at android.os.Handler.handleCallback(Handler.java:815)
        at android.os.Handler.dispatchMessage(Handler.java:104)
        at android.os.Looper.loop(Looper.java:207)
        at android.app.ActivityThread.main(ActivityThread.java:5845)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:768)

Anyone knows what this is due to? The error is not at least a bit enlightening...

Answer 1

If you are using FirebaseUI, you must put this exact string in strings.xml:

APPID The APPID can be found on your developers.facebook.com dashboard.

See Firebase auth readme

Also be sure to add your android key hash and OAuth firebase URL in the facebook app.