InvitationID null in production but not in the same apk installed manually - google-play-services

Question

I have a very strange beaviour in my game.
First of all, I have two version: paid and free, linked in same play service ID.
I developed and try the apps, and they work perfectly, so I put them in production, on google play.
Then I discover by feedback that the paid version, when accept the invitation, don't handle, becouse it's null!
In the free version instead, it works fine.
THE CODE IS THE SAME.
How is possible?
The same APK installed manually works, then put on google play doesn't works.
Anyone has this problem?
This is the code:
#Override
public void onSignInSucceeded() {
super.onSignInSucceeded();
Log.i(GameProps.TAG, "invitation: "+getInvitationId());
if (getInvitationId()!=null) {
Intent intent=new Intent(this, OnlineGameScreen.class);
intent.putExtra(GameProps.INVITATION_ID, getInvitationId());
startActivity(intent);
}
}
getInvitationId() return null.
How it is possibile?
Bye.

Answer 1

I solved.
The code before is changed with this:
#Override
public void onSignInSucceeded() {
super.onSignInSucceeded();
getGamesClient().loadInvitations(new OnInvitationsLoadedListener() {
#Override
public void onInvitationsLoaded(int statusCode, InvitationBuffer buffer) {
ArrayList<Long> timestamps=new ArrayList<Long>();
for (Invitation invitation:buffer) {
timestamps.add(invitation.getCreationTimestamp());
}
Collections.sort(timestamps);
if (!timestamps.isEmpty()) {
for (Invitation invitation:buffer) {
Log.i(GameProps.TAG, "invitation buffer: "+invitation.getInvitationId());
if (invitation.getCreationTimestamp()==timestamps.get(timestamps.size()-1)) {
invitationId=invitation.getInvitationId();
}
}
}
Log.i(GameProps.TAG, "invitation: "+invitationId);
if (invitationId!=null) {
Intent intent=new Intent(MainScreen.this, OnlineGameScreen.class);
intent.putExtra(GameProps.INVITATION_ID, invitationId);
startActivity(intent);
}
}
});
}
So I have to say that GooglePlayGames lib is buggy, becouse getInvitationId() doesn't work correctly.
Expecially becouse it works if apk is installed manually, and not for app downloaded from playstore.
It's happend with 2 of 4 of my apps, so I think it will remain a mistery.