So most google hits for rotating skybox suggest putting something this in an Update:
RenderSettings.skybox.SetFloat("_Rotation", Time.time * 1.23f);
Or something like this if you have a skybox component on your camera:
GetComponent<Skybox>().material.SetFloat("_Rotation", Time.time * 1.23f);
I've tried both with the first method (without a skybox component on the camera) and the second method (with a skybox component on the camera) and neither work. There is no error thrown fwiw. Also I am able to change the skybox material at runtime no problem, so it's not that I'm unable to access the material, it seems more that setting the _Rotation is having no effect.
Any advice appreciated. Thanks