Having a similar issue here. I last updated my Unity app less than one month ago, I've made very few changes to my code in that time. Here's my error: ITMS-90338: Non-public API usage - The app references non-public selectors in Frameworks/UnityFramework.framework/UnityFramework: applicationWillFinishLaunchingWithOptions:, callWithArguments:, didReceiveRemoteNotification:, estimatedProgress, frameInfo, initWithFrame:configuration:, isMainFrame, loadPlugin, navigationType, setNavigationDelegate:, setProcessPool:, toDouble, toString, userContentController. Seems like I'm not alone, hopefully Apple is on this... Thanks.