I am trying to Run the Directory Sync tool and it is giving me the following error as stated below.

Steps I have tried:

1- Used the Enterprise Admin account and have added it in the child domains and in the build in admin group.

2 - Deleted the MSOL Accounts and ran the setup again the accounts recreates but no luck

3 - Have used the domain\administrator accounts but still no luck

This is the error on privilege when adding a user in the Azure. Please try to add your default Administrator with Enterprise Admin privilege and try again. The Enterprise Admin account is not included at the default admin account and it may causing this error.