title: Firebase Authentication Failed [Access not configured]
body: <p>Hi I've been using firebase for months but this problem never occured on my other projects. I wrote same code for authentication with email/password when I want to sign in use regular  signInWithEmailAndPassword() method it give me this error:</p>
  
  <pre><code> com.google.firebase.FirebaseException: An internal error has occurred. [ Access Not Configured.
   Google Identity Toolkit API has not been used in project &lt;Project-id&gt; before or it is disabled. Enable it by visiting https ]
   at com.google.android.gms.internal.zzbix.zzcb(Unknown Source)
   at com.google.android.gms.internal.zzbiu$zzj.zza(Unknown Source)
   at com.google.android.gms.internal.zzbjf.zzcc(Unknown Source)
   at com.google.android.gms.internal.zzbjf$zza.onFailure(Unknown Source)
   at com.google.android.gms.internal.zzbja$zza.onTransact(Unknown Source)
   at android.os.Binder.execTransact(Binder.java:453)
  </code></pre>
  
  <p>I enabled it email/password sign-in method in firebase console I also re generate sha-1 sign and overwrite existing google-service.json But none of them solve my problem.</p>
  
  <p>Edit for code example:</p>
  
  <pre><code>mAuth.signInWithEmailAndPassword(email, password)
             .addOnCompleteListener(LoginActivtity.this, new OnCompleteListener&lt;AuthResult&gt;() {
                 @Override
                 public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
                     if (!task.isSuccessful()) {
                         Log.w(TAG, "signInWithEmail:failed", task.getException());
                     }
                 }
             });
  </code></pre>