Windows Server 2019 AD & DNS replication

Hello,

I'm running into issues with AD & DNS replication on a recently joined server in our environment.

Environment:

• Three writable DCs in separate sites:
  • Server A (Site A) – Windows Server 2019, AD DS & DNS (healthy)
  • Server B (Site B) – Windows Server 2019, AD DS & DNS (healthy)
  • Server C (Site B, new) – Windows Server 2019, AD DS & DNS (failing)

Issues Observed

1. Inbound replication to Server C from Server A & Server B successfully propagates for both AD and DNS zone/record changes.
2. Outbound replication from Server C to Server A & Server B fails for both AD and DNS zone/record changes.
3. Server A logs Event ID 1311 (KCC).
4. Server A & B logs Event ID 1925 when trying to establish the link to Server C.

What I’ve Tried:

1. Pointed each servers NIC's to a heathy DC with the correct suffix. 
2. I've checked any windows FW and network FW rules to make sure no blockages.
3. Verified A+SRV records for both heathy DC's.
4. Confirmed AD-Integrated zones on all 3 servers show correct ACLs and records.
5. I've tried running repadmin  → still errors.
6. Tested RPC connectivity: TCP 135 open.
7. Ensured subnets/site mappings are correct in Sites and Services.
8. I've tried to seed a zone and record on the healthy servers in efforts of t/s.

Any help would be greatly appreciated!