LZW31 Manual Dimming not working

I cannot get one Red Dimmer, (“RD”) LZW31-SN to dim the light attached physically to another RD. They both have neutral wires. The Right Side switch has a line and neutral wire. The let side switch has a line, neutral and load wire going to the light I want to control. The RD the light is physically attached to is the Left Side dimmer and the one I want to push is the Right Side dimmer. I have the physical push of the Left Side RD turned off as I have pushing it controls a different light. Using Hubitat’s rule machine I do have it working that pushing the Right Side switch up (#1) turns the light attached to the Left side on to 100%, pushing the Favorite/Config button (#7) turns the light attached to the Left side switch to 35% and pushing #1 down (“held”) turns the left side light out.

Since I found this thread a bit confusing as to whether Param 6 or 8 is really the one that works while being held I tried both combinations in Hubitat (and even tried have both 6 and 8 set at the same time), but none of those combinations worked. Besides posting screen shots of my RM Rules using Param 6 or 8, I’m also posting my preference settings for Params 1-12 for both switches.

Can somebody tell me how to set this up such that holing the Right Side switch up with brighten the light physically attached to the Left Side switch and holding it down dims the left side light down?