Microsoft SQL Passive Servers
In Purchasing, the machines in this list were marked as SQL passive servers when you assigned licenses of SQL Server to machines in the Edit Assignments dialog box (for non-computers). Since organizations generally designate passive servers for failover purposes, License Analytics does not analyze data from SQL passive servers.
If you decide to change how you use SQL passive servers, update your assignments in Purchasing. When finished, return to License Analytics and select the icon next to Summary in the left pane to recalculate data.