NSX-T and vSAN Licenses

Hi there,

We are running VDI on VxRail and need to add 10 additional nodes. The licences we are using for vSAN is "vSAN Advanced for Desktop" and NSX "NSX Data Center Advanced".  I want to understand how these licences are being consumed and if we need to add more licenses if we add new servers. 

We are using concurrent user-based licences, but usage is showing 0 in NSX-T manager and 0 for vSAN in SDDC. Can someone please help?