Android Studio Assistant: No clients were able to be added to your Firebase project
<p>When using the the new (Firebase) Assistant in Android Studio to add new services I get this error:</p>

<blockquote>
  <p><strong>Firebase</strong></p>
  
  <p>No clients were able to be added to your Firebase project for the following reasons:
           An app with this package name and SHA1 is already connected to a Google project. If you have used a Google API previously, please
  select that project in the Connect to an existing Project list.</p>
</blockquote>

<p>On the <a href="https://console.firebase.google.com/" rel="noreferrer">Firebase console page</a> I had selected the option <code>IMPORT GOOGLE PROJECTS</code> and then I continued on integrating the Firebase Services. But when I try to use the Android Studio Firebase Assistant to add more services I get the error above.</p>

<p>And I can't find this <code>"in the Connect to an existing Project list"</code> anywhere?</p>