title: Android GoogleAuthUtil returning only Unknown exception
body: <p>I tried to setup my Android app to authenticate with my own server using OAuth 2.0. What I did:</p>
  
  <ul>
  <li>Creating a Web app in Google Developers Console (Project X).</li>
  <li>Creating a Android app in Google Developers Console (Project X) with the debug keystore (used by me app) and the package name of my app.</li>
  <li>Using the Web apps client id to get the token with GoogleAuthUtil.getToken() where the scope is "audience:server:client_id:" + the Web apps client id.</li>
  </ul>
  
  <p>All I get is this "unknown" exception and while searching Stackoverflow and Google did't help me I hope someone can point me in the right direction.</p>
  
  <p>Are there additional steps that I need to take besides the ones I stated above? Even the smallest hint is greatly appreciated!</p>
  
  <p>EDIT:</p>
  
  <pre><code>com.google.android.gms.auth.GoogleAuthException: Unknown
  at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
  at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
  at dalvik.system.NativeStart.run(Native Method)
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in &lt;filename unknown&gt;:0 
  at Android.Runtime.JNIEnv.CallStaticObjectMethod (IntPtr jclass, IntPtr jmethod, Android.Runtime.JValue[] parms) [0x00064] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.21-series/9e05e39f/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:1161 
  at Android.Gms.Auth.GoogleAuthUtil.GetToken (Android.Content.Context context, System.String accountName, System.String scope) [0x00000] in &lt;filename unknown&gt;:0 
  at MyProject.&lt;chooserResult&gt;b__3 () [0x00002] in MyProject\File.cs:171 
  --- End of managed exception stack trace ---
  com.google.android.gms.auth.GoogleAuthException: Unknown
  at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
  at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
  at dalvik.system.NativeStart.run(Native Method)
  </code></pre>
  
  <p>EDIT2:</p>
  
  <p>I used GoogleAuthUtil.GetToken(Context, accName, googleAuthScope) where</p>
  
  <ul>
  <li>Context is the activity context</li>
  <li>accName is the accounts mail address</li>
  <li>googleAuthScope is the scope stated above: "audience:server:client_id:"</li>
  </ul>