There is an error in your statement. Try this using the “Local Client” mode of the debugger

names of groups of local computers of active directory
If that still gives and empty result, check to see if you have a populated cache by viewing the file “C:\Program Files (x86)\BigFix Enterprise\BES Client__BESData__Global\ADCache\ADObjectLocalComputer.xml”.
I’ve seen cases where the agent starts up while AD cannot be accessed so the machine has no AD cache for the inspectors to inspect and can lead to inaccurate results. It its an empty/non-existent file, try restarting your client, in case your agent was started before AD was accessible (e.g. work from home and VPN wasn’t up). AD cache will refresh every 12hrs by default though that can be configured via client settings…just be mindful not to be too set it too low as it could have a negative impact.
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0023242