I’m posting this because I spent around six hours trying to figure it out and I hope it helps someone else or future me.
If SwitchboardListener.exe does not launch at all, shows no console window, no logs, and no errors, while Switchboard itself opens normally, check if your Windows username contains any non-ASCII characters such as ñ, é, ü or similar.
In my case the Windows user folder was named C:\Users\diseño, and that single non-ASCII character was the root of the problem. Creating a new Windows user account with only ASCII characters in the name (A–Z, a–z, 0–9), giving it administrator privileges, logging in, and running Switchboard and SwitchboardListener from there solved it immediately.
Hopefully this helps someone avoid wasting time chasing other possible causes.