Google Play Services Authenticate

Hi,

I recently updated Unity to version 5.3.5, the android sdk and I'm using the GooglePlayGamesPlugin-0.9.34 and now my app doesn't work, it doesn't authenticate anymore. I didn't change the code, I just followed the instructions to upgrade the plugin.

Previously I was working with Unity 5.3.3 and GooglePlayGamesPlugin-0.9.32 and everything worked just fine. I don't know how to downgrade versions and I'm using a mac.

a simplified codecode for reference:

 using UnityEngine;
 using System.Collections;
 using GooglePlayGames;
 using UnityEngine.SocialPlatforms;
 
 public class botones_script : MonoBehaviour {
 
     public UnityEngine.UI.Text nombre;
     public UnityEngine.UI.Text puntaje;
     public UnityEngine.UI.Text agregado;
 
     void Start () {
         GooglePlayGames.PlayGamesPlatform.Activate();
 
         nombre.text = "activo";
     }
 
     public void mostrar(){
         if (!Social.localUser.authenticated) {
             nombre.text = "Primer intento";
             Debug.Log ("Primer intento");
 
             Social.localUser.Authenticate((bool success) => {
                 if(success){
                     nombre.text ="entra a googleplay ";
                 }else{
                     nombre.text ="no entra a googleplay ";
                 }
 
             });
         } else {
             agregado.text = "ya entro en algun momento";
         }
     }
 }

Thank you.