title: Android GCM error authentication sender account
body: <p>It's been a while since I created a Android app with GCM integrated. Previously in the API console you would specify the server IP as a white list. However on my latest project this option is not there. Instead it asks for the SHA1 from the signing key which I have configured. </p>
  
  <p>However when I try to send a notification to a registered device ID I get </p>
  
  <p>"There was an error authenticating the sender account"</p>
  
  <p>I am using the correct API key so I can't see what is wrong. </p>