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When reporting achievements (achievement unlock/increment) I get error 'client reconnect required'. The achievement is unlocked when you check achievements popup but it resets when re-running the game. This only appears when apk is uploaded(signed with release) but it works fine when just debugging (signed with debug).

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This is probably because you did not create the "Linked App" oauth2 client id in the google play console as outlined in the docs

Warning: Make sure to record the package name and signing certificate that you configured in this step. Using a different certificate or package name in your application will cause authentication failures.

user4603158
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