We have introduced a cronjob file in Version 1.32 to mitigate the issue with WHMCS not running the creation hook during a domain registration.
You may run the cronjob at a regular interval to ensure your newly registered domains zone are on the DA server.
For security reason, you may rename the cronjob file to any file name so that random person cannot access the cronjob via http.
To run the cronjob every 15 minutes, you would set the cronjob as follows
Every 15 minutes
*/15 * * * * wget -O - https://yoursite.com/modules/addons/dnssuite/cron.php >/dev/null 2>&1