The forest has an invalid replication authentication mode (msDS-replAuthenticationMode). It uses negotiate pass-through authentication, ...

The forest has an invalid replication authentication mode (msDS-replAuthenticationMode). It uses negotiate pass-through authentication, but the source service account is not a local non-system account. Replication with the source server will not be possible.

Please adjust the replication authentication mode on the source server before installing any replicas. Use repadmin /replAuthMode command. For more information about replication authentication mode, see "Replication and configuration sets" in the Active Directory Domain Services Administrator's Guide.