Google play services error with generating OAuth2.0 client

Question

I am trying to test google play services features in an app that i have already published.

I went through the below link to do that.

https://developers.googl

Answer 1

I was facing the same problem and once i opened my Google APIs Console, There i found already an OAuth2 key which i generate for testing purpose. I deleted that key, came back to my Game service and tried the same procedure to link and verify my game. It works. Try it out.

Answer 2

Make sure you use the same projectID in google API. Do not create a new one.