I searched the engine’s directory tree for “Apple Computer” and the hits that look related to your issue are in the function FIOSTargetSettingsCustomization::OnInstallProvisionClicked() (Engine\Source\Developer\IOS\IOSPlatformEditor\Private\IOSTargetSettingsCustomization.cpp). That looks like what happens when you click the provision button I saw in project settings. It looks like it has something to do with SSH settings. This “IPP Process” is getting run outside of UE4 and it’s reporting back that there is an error. I can’t say more yet and I’m not even sure that error is why the build fails. But it’s at least some help. Maybe somehow the SSH thing is confusing iOS and Android.
Edit: I see this in the log file: “C:\Users\Shadow\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Epic+Games+UE_4.18\UAT_Log.txt for full exception trace”. Can you check that log file?