From your Load Balancer shown above, right click on the Load Balancer Icon and add either of the following options manually to continue the traffic-based process: (Here we are assuming that your EntryPoint Type is the Citrix/XenApp presentation Server Endpoint)

1. Add a Connection: CI Type = "XenApp presentation Server Endpoint", then put in the IP address & Port of your Citrix Delivery Controller [port 80 or so] or your Storefront server [ for e.g Port 443] select the active VIP choice IP address and NOT the VIP IP itself if hosted on a vmware virtual cluster Node], then "Resume /Re-run Discovery" in Service Mapping of the application Service.

Confirm what the Topology looks like and if it contains your Citrix env components like [Storefront, Delivery Controllers, Director Servers, Domain Controllers and License Servers etc...)

2. Add a CI : CI Type = "Windows Server" , then add the hostname of the StoreFront Server(s) from your CMDB lookup list and then Resume /Re-RUn Discovery.

The above should get you some results....