title: The fingerprint you specified is already used by an Android OAuth2 client ID in this project or another project
body: <p>I noticed my SHA1 number showing from the gradle view signing report in android studio was different from the one I had originally. I thought maybe it was from changing computers a year ago. My game app was still able to access leaderboards and achievements. I when to my Google API dashboard I noticed the 'OAuth client' had my old SHA1. It wouldn't let me change it to my new SHA1, saying it 'had already been used by this client or another client', although I had no other clients. The mysterious 'Anroid client 1' and 'Android client 2' had neither the old or new SHA1. Underneath the 'OAuth client' was 'OAuth client (auto created by google service)' which had my new SHA1. I went ahead and deleted that one, despite a warning it gave me that it had been used 147 times in the last week (evidence of impending senility on my part I suppose). It seemed I had to delete it to free up the number for my 'OAuth client' that was not auto created. </p>
  
  <p>Now it appears I'm screwed, as it still gives me 'the already in use message' when I try to change the SHA1, and my game app can no longer access Google Play Services at all. I'm thinking I should have deleted the 'OAuth client' instead. Can I recover from this? Will it free up over time? Another post suggested 7 days for clients to be removed, although I don't see a button to delete the whole client, and am concerned over the deletion of the API codes on the same page.</p>
  
  <p>EDIT 3/30 - It looks like I may have lost this number permanently, although (I'm hoping) it only affects my Leaderboards and Achievements, not Firebase, Inapp Purchasing, or Ads. I can roll my own Leaderboards and Achievements in Firebase anyway. New projects with different package names give me the same unusable SHA1 in the Gradle signingReport.</p>
  
  <p><a href="https://i.stack.imgur.com/Ghfai.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ghfai.png" alt="enter image description here"></a></p>