Need command or script to unlock user account in window machine
I feel like we may be missing some info in your question.
If you are trying to manage local accounts with bigfix you can use net user.
Check here https://www.windows-commandline.com/cmd-net-user-command/
The general rule is first figure out the way to accomplish what you need via command line methods (you can use either CMD or PowerShell), then you can build a script that you can deploy and execute via Bigfix.