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[Samba] WERR_DS_DRA_MISSING_PARENT while Joining Samba4 DC to Samba4 Domain

I have a Samba4 Domain Controller, which we have run in production since ~2009 (early alpha). It's had a few issues over the years which we've managed to recover from. I'm trying to join a second Samba4 DC to the domain, but having trouble when I issue the join. I have run dbcheck on the existing DC, which found and fixed some errors. There are still about 60+ errors like this:

    # samba-tool dbcheck --cross-ncs
    ERROR: no target object found for GUID component for objectCategory in object DC=...
    Not removing dangling forward link

I'm running the same Samba version on both systems. Just upgraded to 4.7.3 (Ubuntu 18.04 beta) in attempting to resolve this problem. (I attempted with earlier versions with the same problem.)

Any suggestions would be greatly appreciated!

Here is the output from the second DC when I attempt to join:

$ samba --version
    Version 4.7.3-Ubuntu
$ sudo samba-tool domain join redacted.domain.local DC -U"REDACTED\my.domain.admin"  --dns-backend=SAMBA_INTERNAL
Finding a writeable DC for domain 'redacted.domain.local'
Found DC samba4dom.redacted.domain.local
Password for [REDACTED\my.domain.admin]:
NO DNS zone information found in source domain, not replicating DNS
workgroup is REDACTED
realm is redacted.domain.local
Adding CN=SAMBA4DC2,OU=Domain Controllers,DC=redacted,DC=domain,DC=local
Adding CN=SAMBA4DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=redacted,DC=domain,DC=local
Adding CN=NTDS Settings,CN=SAMBA4DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=redacted,DC=domain,DC=local
Adding SPNs to CN=SAMBA4DC2,OU=Domain Controllers,DC=redacted,DC=domain,DC=local
Setting account password for SAMBA4DC2$
Enabling account
Calling bare provision
Looking up IPv4 addresses
Looking up IPv6 addresses
No IPv6 address will be assigned
Setting up secrets.ldb
Setting up the registry
Setting up the privileges database
Setting up idmap db
Setting up SAM db
Setting up sam.ldb partitions and settings
Setting up sam.ldb rootDSE
Pre-loading the Samba 4 and AD schema
A Kerberos configuration suitable for Samba AD has been generated at /var/lib/samba/private/krb5.conf
Provision OK for domain DN DC=redacted,DC=domain,DC=local
Starting replication
Schema-DN[CN=Schema,CN=Configuration,DC=redacted,DC=domain,DC=local] objects[402/1550] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=redacted,DC=domain,DC=local] objects[804/1550] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=redacted,DC=domain,DC=local] objects[1206/1550] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=redacted,DC=domain,DC=local] objects[1550/1550] linked_values[0/0]
Analyze and apply schema objects
Partition[CN=Configuration,DC=redacted,DC=domain,DC=local] objects[402/1606] linked_values[0/0]
Partition[CN=Configuration,DC=redacted,DC=domain,DC=local] objects[804/1606] linked_values[0/0]
Partition[CN=Configuration,DC=redacted,DC=domain,DC=local] objects[1206/1606] linked_values[0/0]
Partition[CN=Configuration,DC=redacted,DC=domain,DC=local] objects[1605/1606] linked_values[22/22]
Replicating critical objects from the base DN of the domain
Partition[DC=redacted,DC=domain,DC=local] objects[76/74] linked_values[21/21]
Partition[DC=redacted,DC=domain,DC=local] objects[478/19960] linked_values[0/0]
Failed to commit objects: WERR_DS_DRA_MISSING_PARENT
Join failed - cleaning up
Deleted CN=SAMBA4DC2,OU=Domain Controllers,DC=redacted,DC=domain,DC=local
Deleted CN=NTDS Settings,CN=SAMBA4DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=redacted,DC=domain,DC=local
Deleted CN=SAMBA4DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=redacted,DC=domain,DC=local
ERROR(runtime): uncaught exception - (8460, "Failed to process 'chunk' of DRS replicated objects: WERR_DS_DRA_MISSING_PARENT")
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 176, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 661, in run
    machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
  File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1474, in join_DC
  File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1377, in do_join
  File "/usr/lib/python2.7/dist-packages/samba/join.py", line 936, in join_replicate
  File "/usr/lib/python2.7/dist-packages/samba/drs_utils.py", line 295, in replicate
    schema=schema, req_level=req_level, req=req)

Daniel McFeeters 

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