Installed new Floodlight camera and camera works fine, and lights come on just as advertised. Now trying to adjust brightness and the control says offline /not responding. How can that be? How do I get control over the brightness?
I would suggest that you first try to restart your Nest Cam with Floodlight (wired) which you can learn how to do here. If not a restart, Factory Reset your camera and try to see if this fixes the issue first.