RHDS 12 - Cannot create a new Root Suffix using LDIF.

Issue

Trying to create a root suffix using LDIF is failing with RHDS 12 ( RHEL 9 ).

$ cat /var/tmp/root_suffix.ldif
dn: cn="dc=example,dc=com",cn=mapping tree,cn=config
changetype: add
cn: dc=example,dc=com
objectclass: top
objectclass: extensibleObject
objectclass: nsMappingTree
nsslapd-state: backend
nsslapd-backend: UserData
$

$ ldapmodify -x -D "cn=Directory Manager" -W -H ldap://localhost:389 -y /root/DM.txt -f /var/tmp/root_suffix.ldif
adding new entry "cn="dc=example,dc=com",cn=mapping tree,cn=config"
ldap_add: Server is unwilling to perform (53)

$