Building A Red Team Cyber Range Lab | Joining Two Forests - Part II

Even after the domain trusts, I don't see the new group and users in other domain. I'm able to select any existing groups, but any newly created groups doesn't show up to add in a Foreign domain. One thing I noticed is that I see the NTDS replication generated automatically in One domain, but in the foreign domain, it's empty. I tried to create manually but it's not working. Any troubleshooting tips?