Play game saves ((PlayGamesPlatform)Social.Active).SavedGame.OpenWithAutomaticConflictResolution doesn't invoke save function - unity3d

Question

Good day!
I am new to Google Play Services and want to save JSON(string) into the cloud and it doesn't work. I narrowed down a problem through phone and debug texts and realized that a function from ((PlayGamesPlatform)Social.Active).SavedGame.OpenWithAutomaticConflictResolution is not called which is strange because in the tutorial that I watched everything worked and the user logged in successfuly.
here is a code snippet with a comments and a function that is not invoked(I can send a whole script if needed also). Is there something else I am missing?
public void OpenSaveToCloud(bool saving)
{
// debugtext.text = "hello";
if(Social.localUser.authenticated)
{
debugtext.text = "Authorized and proceed to save";
issaving = saving;
((PlayGamesPlatform)Social.Active).SavedGame.OpenWithAutomaticConflictResolution
(SAVE_NAME, GooglePlayGames.BasicApi.DataSource.ReadCacheOrNetwork,
ConflictResolutionStrategy.UseLongestPlaytime, SavedGameOpen); //SavedGame open must be called
}
else{
debugtext.text = "No authentication";
}
}
private void SavedGameOpen(SavedGameRequestStatus status, ISavedGameMetadata meta)//this function is not called
{
if(status == SavedGameRequestStatus.Success)
{
// debugtext.text = "hello in save1";
if (issaving)//if is saving is true we are saving our data to cloud
{
debugtext.text = "Saving....";
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes(GetDataToStoreinCloud());
SavedGameMetadataUpdate update = new SavedGameMetadataUpdate.Builder().Build();
((PlayGamesPlatform)Social.Active).SavedGame.CommitUpdate(meta, update, data, SaveUpdate);
}
else//if is saving is false we are opening our saved data from cloud
{
debugtext.text = "Loading...";
((PlayGamesPlatform)Social.Active).SavedGame.ReadBinaryData(meta, ReadDataFromCloud);
}
}
else{
debugtext.text = "Save request status broke";
}
}
What I checked twice before posting question:
Turned on Saved Games in google console
made build with your keystore and password
add email id in game service's tester section

Answer 1

Mistake is that you have to initialize save games from start as well and I didn't know that so answer would be
if (platform == null)
{
PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder().EnableSavedGames().Build();
PlayGamesPlatform.InitializeInstance(config);
PlayGamesPlatform.DebugLogEnabled = true;
platform = PlayGamesPlatform.Activate();
}