How to list and add the machines of vCenter using MCCLI those are not added to Avamar domain yet?

After adding a vcenter to the Avamar server, to add a new machine, I can right click on a domain and click new client, you will get option to Browse to all the machines.  When you check the box "show sub-domain virtual machines", it will list all VMs what ever you see in the vCenter.  I can add any machine I want to the vCenter Domain in Avamar.

I want to do that same thing using MCCLI.  "mccli client show" did not work as it can only show the machines already added to the Avamar domain under a vCenter server in Avamr.

Here is the command line and the error I got.  I do not get any errors when I add it using Avamar Admin Console.  Just to note this CentOS VM is part of a vApp in vCloud Director and a machine in a resource pool in vCneter context.  I do not get the error when I add a Windows machine that is NOT in a resource pool, but just a regular VM in vCenter.

mccli client add --type=vmachine --domain=/10.X.Y.Z/TestCompanyName --name="TestVM1 (c343d3e3ed234534tr34r34534345qdf)" --datacenter="TestDataCenter"

1,22356,Encountered null virtual machine object

The above error is basically telling that machine is not found.

Is there any way I can check the logs on the Avamar side for every opearation I do in Avamar Admin console, like some IDEs will allow you to see the command ran behind when you run a task in the GUI?