Unable to enable auditlog in openldap 2.4

[kalybox2020]

We are using cn=config file for configuration. 
Using ldapmodify 
 dn: olcOverlay={8}auditlog,olcDatabase={1}hdb,cnc=config
objectclass: olcOverlayConfig
objectClass: olcAuditlogConfig
olcAuditLogFile: /var/log/ldapauditlog.ldif


restarted slapd,
Gave permissions to this file, and restarted slapd,
still not able to generate logs.

Thanks
-Kaly