When comparing config change line with NCM and not able to see who has made the last configuration change on firewall and internet devices

When comparing config change line with NCM and not able to see who has made the last configuration change(example : User name or id ) and facing this issue only for firewall and internet devices. 

Does any one has faced the same issue ? if yes can you tell us the reason why this is not visible only firewall and internet devices ?

The below result is coming for switches and routers but the same result is not working for firewall and internet devices...

Last configuration change at 13:01:15 CST Thu Apr 22 2021 by xxxxx
3
! NVRAM config last updated at 10:00:57 CST Tue Apr 27 2021 by xxxxx
3