The Parameters list is only for option 55 parameters.The dhcpoptions field is what can (or must) be included in the request, but the parameters is what can (or must) be included depending on your match type. So, now, you cannot include option 60 para...
Does your Operations panel say that the devices are being discovered? If so, then check your Actions tab and make sure the “Automatically Add” option is enabled.
FYI the Java/Legacy clients will not be going away, as originally planned, so you will still have the ability to perform whatever functions in the Java clients that have not/will not be ported to the Web UI for future revisions.
You will notice all default Defender roles begin “DFNDR.” Any role you want to be recognized by the Defender container that you make in either the XCA or XMC GUI must begin with DFNDR for the app to recognize it.