I have two standalone app written for watchos (standalone). One to authenticate and one for connectivity to real-world devices. The connectivity app uses the authentication app before every action, Im testing this with two xcode projects I have created and tried different things ended up with this error. authapp://authenticate?callback=linkingapp://callback -[SPApplicationDelegate extensionConnection:openSystemURL:]:2418: URL with scheme "authapp" not supported how to get the url scheme working? Tested this in simulator and real device. info.plist and AppDelegate files are placed in both apps.