How to set up proper samba DC replication?

Question

Active Directory

Hello, there was a samba domain controller with an asset directory on zential, then another machine was raised and entered into the domain as a second domain controller, well, actually the question is, you create a dusertale on the main controller, it goes into the second normally, that is, replication works in this direction , but there is no way in the opposite direction, that is, all users created on the second controller do not appear on the first one, where to dig??