@Vivak Hangloo , Since the machines and personal devices got Azure AD registered, hence their device object got created in Azure AD with the device assigned to that user under whose context the Azure AD device registration happened.
In this case no need to need to sync the device objects to cloud. In case in future you plan to get your organization machines to get Hybrid Azure AD joined, at that point of time syncing these device objects would be required.
Hope this helps.
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