1. Log in to WHM on ns3.oryon.net
2. Go to Home »Development »Manage API Tokens
3. Click the “Generate Token” button.
4. Enter a name for your token. Eg: dnscluster
5. Put a check next to the “DNS Clustering” privilege to enable it
6. Click save and copy the newly generated API token.
7. Now, log in to WHM on new shared server.
8. Go to Home »Clusters »DNS Cluster.
9. Enable DNS Clustering if it is not already enabled.
10. Select the Configure button to add a new cluster member
11. Enter the IP address or hostname of ns3.oryon.net.
12. Enter root as the username
13. Paste the API token into the box.
14. Select “Synchronize Changes” as the DNS Role
15. Save.
For reference : https://support.cpanel.net/hc/en-us/articles/360053742353-cPanel-DNS-Cluster-Guide
Note : Repeat the above process to sync with other shared servers.