samba - Aug 2020 - Failed to find our own NTDS Settings DN in the ldb!

FreeBSD-12.1p7
Samba-4.10.15

I attempted (and failed) to restart the second DC on a test domain and got this
error in smbd.log

Failed to find our own NTDS Settings DN in the ldb!

[root at smb4-1 ~ (master)]# host -t A smb4-1.brockley.harte-lyne.ca
smb4-1.brockley.harte-lyne.ca has address 192.168.18.161

[root at smb4-1 ~ (master)]# host -t A smb4-2.brockley.harte-lyne.ca
smb4-2.brockley.harte-lyne.ca has address 192.168.18.162

[root at smb4-1 ~ (master)]# samba-ldbsearch -H /var/db/samba4/private/sam.ldb
'(invocationId=*)' --cross-ncs objectguid
Searching for dsServiceName in rootDSE failed: operations error at
../../source4/dsdb/samdb/ldb_modules/rootdse.c:518
Failed to find our own NTDS Settings DN in the ldb!
# record 1
dn: CN=NTDS
Settings,CN=SMB4-2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=brockley,DC=harte-lyne,DC=ca
objectGUID: 00d350dd-20ae-4718-be2a-90c924adc19b

# record 2
dn: CN=NTDS
Settings,CN=SMB4-1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=brockley,DC=harte-lyne,DC=ca
objectGUID: aac648b2-aac8-411d-afe0-7cbd5455841c

# returned 2 records
# 2 entries
# 0 referrals


Up to this point I have not experienced problems in getting both DCs to start.
How do I fix this?  How did this error become introduced?

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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3