title: Google Sign in error after Firebase owner changed
body: <p>The app was working fine till the ownership in Firebase has changed from my account to my team lead. Now Google Sign in won't work and this is the error that occured.</p>
  
  <p>Google sign in failed
      com.google.android.gms.common.api.ApiException: 7:</p>
  
  <p>I have tried searching a lot of questions but couldn't find any such situations. Please help! I have tried downloading the new Google-Services.json file after the ownership changed. Initially, after the ownership change, there was a compile error for the line
      .requestIdToken(getString(R.string.default_web_client_id))
  saying, cannot resolve symbol : default_web_client_id </p>
  
  <p>After some initial search, I've added the Gradle file - </p>
  
  <pre><code>implementation 'com.firebaseui:firebase-ui-auth:4.1.0'
  </code></pre>
  
  <p>which removed that error but from then on Google Sign in didn't work.</p>
  
  <p>This is the part of build.gradle file</p>
  
  <pre><code>// Firebase Auth
  implementation 'com.firebaseui:firebase-ui-auth:4.1.0'
  implementation 'com.google.firebase:firebase-auth:16.1.0'
  implementation 'com.google.firebase:firebase-core:16.0.6'
  // Google play services
  implementation 'com.google.android.gms:play-services-auth:16.0.1'
  </code></pre>
  
  <p>It also has
       apply plugin: 'com.google.gms.google-services'</p>