How to Fix Error Google Play Games Authentication in Unity Returning Login : Fsiblog I recently spent a few very frustrating days trying to integrate Google Play Games Services authentication into my Unity Android project. What should’ve been a quick setup turned into a rabbit hole of trial, error, debugging, and learning.

So I’m writing this blog post to share my experience from the initial setup, to getting hit with the dreaded “Login Unsuccessful: Canceled” error, and finally arriving at a working solution with some added functionality.

We'll cover:

Common reasons behind the "Returning Login" error
Setting up your app correctly in the Google Play Console
Configuring your OAuth Consent Screen & Credentials in Google Cloud Console
Correctly linking your SHA-1 signing key
Testing with internal app sharing or closed testing tracks
Debugging tips for handling failed login attempts
How to check logcat logs for detailed error messages

This video is perfect for Unity developers who are integrating Google Play Services and running into issues during testing or deployment.

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