Realm join command is failing with "Couldn't join realm: The computer-ou argument must be a valid LDAP DN and contain only OU=xxx RDN values."

Issue

• Realm join command is failing with Couldn't join realm: The computer-ou argument must be a valid LDAP DN and contain only OU=xxx RDN values. i.e:

# realm join example.com -U djoiner -v
 * Resolving: _ldap._tcp.example.com
 * Performing LDAP DSE lookup on: 192.168.1.1
 * Performing LDAP DSE lookup on: 192.168.1.2
 * Successfully discovered: Example.com
Password for djoiner:
 * Required files: /usr/sbin/oddjobd, /usr/libexec/oddjob/mkhomedir, /usr/sbin/sssd, /usr/bin/net
 ! The computer-ou argument must be a valid LDAP DN and contain only OU=xxx RDN values.
realm: Couldn't join realm: The computer-ou argument must be a valid LDAP DN and contain only OU=xxx RDN values.