title: Firebase Auth on a project other than the one the Android application is added to
body: <p>I have a very specific set up, where we have one project that is handling our Auth, but another project where the actual Android/iOS applications are actually added to the project. When using auth for our custom backend, that's fine, but when we try to use our own provider, we get an error back with </p>
  
  <blockquote>
    <p>There was an error while trying to get your package certificate hash.</p>
  </blockquote>
  
  <p>Is there a way to keep the projects added on the mobile project, and still validate authentication through another firebase project?</p>