Google Play Games: 401 error on UnlockAchievement call

I've implemented Google Play Services with this asset: https://github.com/playgameservices/play-games-plugin-for-unity.

I've added Saved Games and Achievements, but looks like achievements don't work properly. It works on my dev device, but o production I see 100% errors:

It looks like it works normally, when achievement unlocked, users see alert from Google Play Games, but after all the can't see achievements in Play Games application. Also we see that nobody unlocked some achievements when I look to the Play Console:

As I understand it's the problem with authorization, I've doeble-checked that I setup OAUTH key correctly, using the same SHA-1 as SHA-1 fingerprint of my sign key.

What can be wrong?

from Google Play Games: 401 error on UnlockAchievement call