My basic issue was that the target iOS version of the newly created extension was higher than the iOS version on the test device. The target iOS version of the extension does not depend on the target iOS version of the app.
Project -> Targets -> your_extension -> General (tab) -> Deployment Info
samir2
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution