Can not get my lamp sockets to link

The sockets are supposed to be able to link up as long as they are within 85 feet, but unfortunately that is not happening for me. I can get the link to happen when i put the second socket in a different lamp closer to the one connected to the cam, but i was hoping to be able control both the back door light, where the cam is as well as the front porch light by linking the two.

I do have a cam on the front as well, but the porch light is in the middle of the porch ceiling, not on a wall, so putting the cam in that location is not really ideal. Perhaps I just need to get the cord extension I have some mention and run that socket all of the way to the cam, but don’t really what that cord running that far.