title: Why does Google log-in with FirebaseUI not work?
body: <p>I'm following <a href="https://github.com/firebase/FirebaseUI-Android/tree/master/app" rel="nofollow noreferrer">FirebaseUI official example</a> however when I try to test Google log-in option after selecting the Google account the app remains unresponsive. The logcat shows the following error:</p>
  
  <pre><code>2018-11-06 18:51:39.779 1929-1940/? W/Conscrypt: Could not set socket write timeout: java.net.SocketException: Socket closed
  2018-11-06 18:51:39.780 1929-1940/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.Platform.setSocketWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:39.780 1929-1940/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.ConscryptFileDescriptorSocket.setSoWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:39.895 1929-1940/? W/Conscrypt: Could not set socket write timeout: java.net.SocketException: Socket closed
  2018-11-06 18:51:39.895 1929-1940/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.Platform.setSocketWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:39.895 1929-1940/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.ConscryptFileDescriptorSocket.setSoWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:40.216 1929-1940/? W/GLSUser: [AppCertManager] IOException while requesting key: 
      java.io.IOException: Invalid device key response.
          at hol.a(:com.google.android.gms@14366022@14.3.66 (040700-213742215):13)
          at hol.a(:com.google.android.gms@14366022@14.3.66 (040700-213742215):61)
          at hol.a(:com.google.android.gms@14366022@14.3.66 (040700-213742215):23)
          at hoj.a(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
          at hoj.a(:com.google.android.gms@14366022@14.3.66 (040700-213742215):9)
          at xfj.a(:com.google.android.gms@14366022@14.3.66 (040700-213742215):3)
          at cje.onTransact(:com.google.android.gms@14366022@14.3.66 (040700-213742215):4)
          at android.os.Binder.transact(Binder.java:604)
          at dly.onTransact(:com.google.android.gms@14366022@14.3.66 (040700-213742215):3)
          at android.os.Binder.execTransact(Binder.java:674)
  2018-11-06 18:51:40.216 1929-1940/? W/GLSUser: [DeviceKeyStore] Cannot load key: Device key file not found.
  2018-11-06 18:51:40.399 2513-5726/? W/Conscrypt: Could not set socket write timeout: java.net.SocketException: Socket closed
  2018-11-06 18:51:40.400 2513-5726/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.Platform.setSocketWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:40.400 2513-5726/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.ConscryptFileDescriptorSocket.setSoWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:40.650 2513-5726/? W/Conscrypt: Could not set socket write timeout: java.net.SocketException: Socket closed
  2018-11-06 18:51:40.651 2513-5726/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.Platform.setSocketWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:40.651 2513-5726/? W/Conscrypt:     at com.google.android.gms.org.conscrypt.ConscryptFileDescriptorSocket.setSoWriteTimeout(:com.google.android.gms@14366022@14.3.66 (040700-213742215):2)
  2018-11-06 18:51:40.975 2513-5726/? E/Volley: [502] BasicNetwork.performRequest: Unexpected response code 400 for https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyAssertion?alt=proto&amp;key=AIzaSyDGPA5UVAhDEXzbDftSdn9-vCezXFvz3-w
  2018-11-06 18:51:40.975 2513-8927/? I/AuthChimeraService: Error description received from server: OPERATION_NOT_ALLOWED
  2018-11-06 18:51:40.978 2513-8927/? W/FirebaseAuth: [PhoneNumberAuthPostProcessor] postProcess starts
  2018-11-06 18:51:40.978 2513-8927/? W/FirebaseAuth: [PhoneNumberAuthPostProcessor] postProcess ends
  2018-11-06 18:51:41.270 1386-1622/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 8924113 , only wrote 8770320
  </code></pre>