title: App is not verified when using Google Provider in firebase login
body: <p>I used <code>firebase.auth.signInWithPopup()</code> from <a href="https://firebase.google.com/docs/auth/web/google-signin#popup-mode" rel="noreferrer">this</a> documentation. However, I am getting this warning on the popup window saying that my app isn't verified yet. See image below.</p>
  
  <p>I don't know where to start from here since as far as I can remember, I can't find anything about this on the firebase auth docs. Any advice?</p>
  
  <p><a href="https://i.stack.imgur.com/lAcC1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lAcC1.png" alt="enter image description here"></a></p>