Hi @JasonWalker this issue has been resolved.
Root Cause: In the ODBC DSN it is configured as “bes_bfenterprise” but in the Registry under HKEY_LM\Software\WOW6432node\Bigfix\EnterpriseServer\Database the configured is “bes_EnterpriseServer”.
That is why i get an error message “Unable to login to server. Have you run BESAdmin to create the signing key on the server? Is the Server able to connect to the database?” every time I tried to login the console.
And also this is the answer why there is no applicable computers found in my baselines.
Upon Checking right now, it has an applicable computers after resolving the issue on ODBC.
I hope I can help to others getting this error too.
Thank you very much Sir @JasonWalker for the help.