Total consumed license count is showing as NULL in the DCS-UMC Console..
The display of Installed Agents is working as designed.
The UI only shows the number of Clientless Agents. Clientless Agents is SVA based protection when integrated with NSX/vCenter
The clientless licenses are consumed only for Agentless protection (via NSX/SVA/vCenter)
While no count of installed Agents is displayed, you do need to ensure that you are in compliance with the license agreement for the number of agents you are using.