Google Play Game Services - Unable to Sign In

Google Play Game Services - unable to sign in

I've fixed this issue.

In my case, when I've linked my app (not yet published) to my Google Play Game Services project, the Certificate Fingerprint auto-selected by Google Play was not the good one.

To fix that, I've deleted my app client ID on Google APIs Console, unlinked my app, then relinked it with the proper Certificate Fingerprint.
This Fingerprint is displayed when exporting your app in Eclipse (if your ADT plugin is up-to-date).

Hope it helps.

Google Play Games Services not able to login - returns Canceled

I have created a new app in my Google Play Console and rebuilt my app with a new key and it works now.

Not sure what was wrong because I followed the same steps as the tutorial, maybe not in the exact same order this time...

Google Play Game Service failing to sign in

I think you should carefully read (or re-read) all the procedure described here.
Add a comment if you need more help on this after you followed the tutorial from the scratch again.

90% of problems with this are related to: wrong sha1 signed certificate, wrong app package name, missing client ID and something like those...

PS: here you can find all the working samples

Failed to sign in Google play game services

Ok so I figured it out, it turns out that if your game is already published to alpha, you have to publish the leaderboards for them to work.(You cannot use them if they are ready for testing)

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