title: Issue with conflicting SHA key when generating google-services.json
body: <blockquote>
    <p>An OAuth2 client already exists for this package name and SHA-1 in
    another project</p>
  </blockquote>
  
  <p>I am receiving this error, when trying to setup google services for my app. i need to generate a google-services.json file which is needed for my apps Google SignIn. Now while trying to set it up, i need to specify the SHA key from my release keystore. And this is where it makes me crazy. Like it says, my SHA key is conflicting with an other project. I tried figuring out in which project this could be.. I looked at every project and every credentials if my SHA key is used by them. Unfortunately i dind´find anything.</p>
  
  <p>Now has anyone an idea how to still use this key for my project or how i can find the project where this SHA key is used? I am pleased for any suggestions :P</p>
  
  <p><a href="https://i.stack.imgur.com/LFMiF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LFMiF.png" alt="enter image description here"></a></p>