Android Subsystem return invalid AuthToken

I’m trying to connect to game sparks with android auth token, but this code return “NOT_ACQUIRED”

   IOnlineIdentityPtr OnlineIdentity = OnlineSubsystem->GetIdentityInterface();
    if (OnlineIdentity.IsValid())
    {
    	return OnlineIdentity->GetAuthToken(0);
    }

Now in GameActivity.java AuthToken request has this placeholder

nativeGoogleClientConnectCompleted(true, "NOT_ACQUIRED");

Hi,
I am in the same situation. Do you managed to get that AuthToken?
Thanks.

any update sir?
i have same problem too