Firebase/facebook Authentication - Oauthexception - Code 190

I've been implementing Firebase authentication in my Android app and have got it working easily & successfully (signed in debug) for different authentication providers such as

Solution 1:

Can you check your Facebook App ID & Secret settings in Firebase Console are correct? If so, please file a bug for Firebase Authentication at https://firebase.google.com/support/contact/bugs-features/

Solution 2:

You are most likely entering wrong app credentials in Firebase account. Try copying them once again. Care:- Facebook hides the app secret for you in settings tab. Click on show and then copy it to your firebase account, else it will show the same error.