High level description of why an Enterprise Admin account is required for DirSync config

Hi all,
I understand that as part of the Azure AD Sync tool config wizard you are required to enter the credentials of an Enterprise Admin account.  These credentials are required for the creation of the MSOL_AD_Sync service account within the Users OU of Active
Directory.  This account is granted read and synchronization permissions to the local Active Directory.
Is someone able to provide a high-level description of what this actually means i.e exactly which permissions are granted and on which objects.  Are we talking about having to modify the permissions of every single object within Active Directory?
Many thanks in advance,
Graham

Hi,
To start with, I guess you would know that this is a Kind of a Temporary.
I have some details from previous conversations and blogs
Hope this puts some light on your query.
When configuring the Microsoft Online Services Directory Synchronization Tool, you are asked to provide the credentials for an account that has
Enterprise Admin permissions on your organization's local Active Directory directory service. It accepts credentials in either of the following forms:
[email protected]
Example\someone
These Enterprise Administrator credentials are not saved. They are erased from the computer's memory after the service account is created.
How the Active Directory Credentials Are Used
The Microsoft Online Services Directory Synchronization Tool Configuration Wizard uses the Enterprise Admin credentials to create the directory
synchronization service account, MSOL_AD_Sync. This service account is created as a domain account with directory replication permissions on your local Active Directory and with a randomly generated complex password that never expires.
Note:
Changing the password associated with the service account is not recommended.
How the Service Account Is Used
When the directory synchronization service runs, it uses the service account credentials to read from your local Active Directory and write to the
synchronization database. The contents of the synchronization database are written to Microsoft Online Services using the Microsoft Online Services credentials requested on the
Microsoft Online Services Credentialspage of the Microsoft Online Services Directory
Synchronization Tool Configuration Wizard.
Note:
If you add a domain to your Active Directory forest, you must run the Microsoft Online Services Directory Synchronization Tool Configuration Wizard
again to add the new domain to the list of domains to be synchronized.
Thanks & Regards
John Chris

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