title: Firebase phone authentication is not working on Android real device
body: <p>I've been trying to achieve phone auth using Firebase authentication. It's working with an android emulator. I used a test number and a real number in the emulator. Both works. But only the test number is working with a real device and throwing this exception for other numbers</p>
  <pre><code>Error is:[firebase_auth/missing-client-identifier] This request is missing a valid app identifier, 
   meaning that neither SafetyNet checks nor reCAPTCHA checks succeeded. 
   Please try again, or check the logcat for more details.
  </code></pre>
  <p>I setup SHA key in firebase also.</p>