Google Play Games Services cannot log in after published the game, is it because I didn't use firebase? Or firebase is needed for Google Play Games Services?
I already replace the old SHA1 with copied SHA1(from "Upload certificate"), and it only works before publishing the game.
SHA1 keys are different for both debug and release version.
This could be the main reason.
This SO post pointed out about the issue:
SHA1 key is different for signed apk. So you have two SHA1, one each for debug and release version. The SHA1 for release version can be obtained from keystore file.
You can learn more here about the difference of two SHA1 version and how to obtain it.
You can also try to have a look on this SO posts:
