You are looking at the “BES Inventory and License” site which is included in BigFix Lifecycle and BigFix Inventory. This is a “light” inventory site for providing basic hardware/software information about a system.
You’re looking specifically for IBM BigFix Inventory which is separate. In the BigFix Management domain under “License Overview” you should find a section called “Inventory”
This will have both BES Inventory and License as well as, “IBM BigFix Inventory v9” in it. You want to activate IBM BigFix Inventory v9.
If IBM BigFix Inventory v9 is not listed then your license does not contain the Inventory license entitlement and you need to look in your IBM BigFix Subscribenet license center to adjust your license allocation, contact your business partner, or contact BigFix licensing support.