title: This app is not authorized to use Firebase Authentication on USB Debugging
body: <p>I have done exactly what this question's answer says: <a href="https://stackoverflow.com/a/53513327/10021456">https://stackoverflow.com/a/53513327/10021456</a></p>
  
  <p>I copied both my <strong><em>App signing certificate SHA-1</em></strong> and my <strong><em>Upload certificate SHA-1</em></strong> to my <strong><em>Firebase SHA certificate fingerprints</em></strong></p>
  
  <p>I am just trying to run a Flutter app on my mobile phone, through USB debugging. So it is not a download from the app store or anything. Right at the start I get this error when I try to create a new user using <strong><em>Phone Number Authentication</em></strong></p>
  
  <p>Any idea on what I might be missing?</p>
  
  <p>(I use <strong><em>Flutter</em></strong> for my app)</p>
  
  <p><strong>Information:</strong></p>
  
  <p>Example phone numbers work fine. But normal/unregistered phone numbers give the error.</p>
  
  <p>This is the error message:</p>
  
  <blockquote>
    <p>This app is not authorized to use Firebase Authentication.Please
    verify that the correct package name and SHA-1 are configured in the
    Firebase Console</p>
  </blockquote>