SSSD failing to pull userinfo from Active Directory.

Issue

• We are integrating a server to Active Directory with SSSD.
• I was able to see few users from "getent passwd" command, but most of the users are not listed in this command and also cannot able to login too.
• I tried cleaning *.ldb files under /var/lib/sss/db/ and restarted SSSD service but no luck.