'realm join' is failing with error "Failed to join domain: Failed to set machine spn: Constraint violation"

Issue

• 'realm join' is failing with the following error even if user is member of "Domain Admins" group:

# realm join -v example.com --computer-ou OU=Servers,OU=DEV -U ad_user
 * Resolving: _ldap._tcp.example.com
 * Performing LDAP DSE lookup on: 192.168.0.1
 * Successfully discovered: EXAMPLE.COM
Password for ad_user:
 * Required files: /usr/sbin/oddjobd, /usr/libexec/oddjob/mkhomedir, /usr/sbin/sssd, /usr/bin/net
 * LANG=C LOGNAME=root /usr/bin/net -s /var/cache/realmd/realmd-smb-conf.GVUCFZ -U ad_user ads join EXAMPLE.COM createcomputer=DEV/Servers
Enter  ad_user's password:
Failed to join domain: Failed to set machine spn: Constraint violation   <-----
Do you have sufficient permissions to create machine accounts?           <-----
 ! Joining the domain EXAMPLE.COM failed
realm: Couldn't join realm: Joining the domain EXAMPLE.COM failed