Android App bundle kills Google Play Games integration (Error 4, SIGN_IN_REQUIRED)

[adamvarhegyi]

Here are the facts:

• My game app is 100% working with debug keystore signed apk using Google Play Games, can sign in, unlock achievements.
• My game app is 100% working with release keystore signed apk using Google Play Games, can sign in, unlock achievements.
• Whenever I try to sign in to Google Play Games with my app using app bundle instead of apk, I get SIGN_IN_REQUIRED error, which is stupid on its own, considering I literally want to sign in.

I only found one guy who found the same issue but he is developing his game in Unity, and my app is a native Android app made with Android SDK, so I don't really get his solution.

I won't input screenshots about console settings and SHA1 keys and linked apps and all about those things because as I said, the only difference between the working versions and the not working version is that the not working version has been made to an android app bundle, instead of an apk, so the integrations is correct.

The sad thing is that my apk is more than 100 MB so Google Play doesn't let me upload it anymore, I have to app bundle.

The process of making my app into an app bundle somehow make Google Play Games integration broken.

Any ideas?