Hello @Khedkar, Vidisha
Thank you for posting on Q&A Forum.
As per my understanding, Cloud Sync is syncing users to Entra ID which is creating duplicate entries.
By Default, all the objects would be synced. To stop the users from automatically syncing to Entra ID apply the scope to only specific OU's. By following the below steps you can scope only specific OU's stopping duplicate entries.
1.Go to Azure Portal and Cloud Sync. Click "All users" to the right of "Scope users"
2.Select "Selected Organizational Units" and enter an OU you wish to add to the provisioning scope
3.Click "Add" and you will see the OU added to the provisioning scope.
4.Save this configuration and the provisioning scope will then be set to the specified OUs.
ADToAADSyncServiceAccount**@xxxx.onmicrosoft.com] is a service account which is created by default at the backend and helps in syncing the objects using cloud sync.
https://learn.microsoft.com/en-us/entra/identity/hybrid/cloud-sync/how-to-configure
It is recommended to use one synchronization tool either Entra ID Connect or Cloud Sync for any given user or group to avoid duplicates.
I hope this information is helpful. Please feel free to reach out if you have any further questions.