Had some difficulty integrating my JVC NZ800 into my remote. I used the JVC integration listed in the device database by Jack Powell. Though it was detecting the projector on my network, my projector was denying the connection. Apparently has something to do with how the JVC handles the password.
I found this very useful post online that helped me sort it out. Hope it will be of use to others.
https://support.habitech.co.uk/hc/en-us/articles/21543558466205-JVC-NZ800-900-series-control-issues