It is possible to submit application to app store, before lunch of iOS 14 with AppTrakingTransparency framework to avoid loose IDFA ? Thanks

I try to Test Attribution with SKAdNetwork, so I'm writing this code code to test : SKAdTestSession *session = [[SKAdTestSession alloc]init]; SKAdTestPostback *testpostback = [[SKAdTestPostback alloc] initWithVersion:@"2.2" adNetworkIdentifier:@"xxxxxxxxx.skadnetwork" adCampaignIdentifier:1 appStoreItemIdentifier:1596467464 sourceAppStoreItemIdentifier:0 conversionValue:0 fidelityType:1 isRedownload:YES didWin:YES postbackURL:@"url"]; NSError *error = [[NSError alloc] initWithDomain:@"" code:0 userInfo:NULL]; BOOL success = [session setPostbacks:@[testpostback] error:&error]; It's return me no error and success is at true but I have no postback in my session. Is there anything wrong ? I'm using Xcode 14.3 Thanks