A Windows 10 system is not showing in the device inventory list, what may be the problem?

Answer options:

A.System is not having the latest KB`s
B.System has no alerts in the past 30 days.
C.System was renamed.
D.None of the above

Correct Answer: B
Option A, C, D are incorrect. Neither renaming any device nor KB’s has any impact on the Device inventory list.
Option B is correct. We can modify the “time setting” to find the system.
Reference: 

https://docs.microsoft.com/en-us/azure/security-center/asset-inventory