Here is the solution to the issue, found this when I installed another software, and SupportAssist / Command Update started working.     Install these, and you should be good to go.    
All of a sudden Dell SupportAssist stopped working. It giving Unexpected error during driver scan. Looks both my personal and office laptops are showing the same error.  OS : Windows 11 Pro SupportAssist Version : 3.14  Tried all these Log - C:\ProgramData\Dell\SupportAssist\Agent\logs\Application\SupportAssistAgent.log show the below error. It looks weird, looks like Dell client issue. Who can help here ? 
Precision 5540 - SupportAssist - Unexpected error occurred