It doesn't matter what method I add a scene with, same result. "Authorization Failed" after it is added.
My ISY is a factory installed Z-wave version and had a scene already added, but had no devices in it. I do not get the "Authorization Failed" with that scene.
My new scene "Test Scene" has a Z-Wave wall outlet module in it for testing, but there is no difference in the results with various devices added to the scene.