Play Game Services not working with a published game

Hi,

I integrated Google Play Game Services on a game that's already published on Play Store, but it doesn't seem to work. I can't even see Play Services login UI.

I'm doing this:

• activating Play Game Services in a script using PlayGamesPlatform.Activate();

• calling login using Social.localUser.Authenticate

I'm able to use Play Game Services on an unpublished game just fine using exact same Developer Console settings and this code. Is there anything else that I need to do to make Play Game Services work on an already published game?

Thanks!