I have an Epson EB-L1505UH and I control the shutter by PJLInk. In a scene, which is always active, I have the "Send PJLink" actor and via Broadcaster-Listener actors I communicate with it. In the projector I have only configured the IP and I have not set a password for the PJLink. The only thing I do set is the password @Panasonic in the Send PJLink actor because I read it in a forum once.
Maybe if you set a password for the PJLink in the projector field,
in the Send PJLink actor you should enter the same one.
I hope this is helpful.