Hello, this is my first post. I’ve recently started replacing all of my home switches with the GE/Jasco switches and now I’m onto the add-on switches. I just installed the first one and it doesn’t appear to be working right. I can turn the light on from this switch but it won’t turn off. Likewise, if I turn it on from the primary smart switch, I can’t turn it off from this add-on switch. So basically everything works but I have no off on the add-on switch. I have 4 wires coming from the wall including 2 black, 1 red, and 1 ground. Here’s my wiring:
Any idea what I could be doing wrong or is the switch just bad?