Social API won't work

[rico345100]

Describe the bug
Using social api won't work. Social.localUser.authenticated always returns false even when signed in successfully, using Social.ShowLeaderboardUI(); always fails with:

02-19 22:19:24.257: I/Unity(7525): ShowAchievementsUI not implemented

To Reproduce
Steps to reproduce the behavior:

1. Install the latest version of this package
2. Sign in
3. Using Social.localUser.authenticated
4. Using Social.ShowLeaderboardUI

Expected behavior
Both should be working.

Observed behavior
Just won't work. Not helpful debug found logcat.

Bug Report
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Versions

• Unity version: 2022.3.45f1
• Google Play Games Plugin for Unity version: 2.0.0

Additional context
I was using 0.10.14 just for the sign-out feature, but now Google forces me to upgrade Play Games SDK v2; otherwise, it won't accept any update, so I updated the GPGS plugin to the latest 2.0.0.

Documentation in the readme has entirely disappeared, and I followed all the steps in the official google play games documentation, but none of them worked.
https://developer.android.com/games/pgs/unity/unity-start

Afaik there were some extra codes like this before the update:

PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder().EnableSavedGames().RequestEmail().Build();
PlayGamesPlatform.InitializeInstance(config);
PlayGamesPlatform.DebugLogEnabled = true;
PlayGamesPlatform.Activate();```

but there is no such PlayGamesClientConfiguration kinda stuff. What the heck should I do then?