Help troubleshooting: Advertised lease scored 0, toss it.

[John W. Blue]

Host is FreeBSD v12 using the dhcp-4.4.1 client complied from ports.

The client is able to get v4 leases without issue.  However, when I issue a request for a v6 lease it fails with "Advertised lease scored 0, toss it.":

#/usr/local/sbin/dhclient -v -6 em0

Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on Socket/em0
Sending on   Socket/em0
PRC: Previous lease is devoid of active addresses.
PRC: Soliciting for leases (INIT).

XMT: Forming Solicit, 0 ms elapsed.
XMT:  X-- IA_NA 29:ba:a7:4c
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on em0, interval 1010ms.

RCV: Advertise message on em0 from fe80::e22f:6dff:fe6d:28d9.
RCV:  X-- IA_NA 29:ba:a7:4c
RCV:  | X-- starts 1546274446
RCV:  | X-- t1 - renew  +43200
RCV:  | X-- t2 - rebind +69120
RCV:  | X-- [Options]
RCV:  | | X-- IAADDR 2001:579:ff01:100:ca3:953c:2911:f8d4
RCV:  | | | X-- Preferred lifetime 86400.
RCV:  | | | X-- Max lifetime 86400.
RCV:  X-- Server ID: 00:01:00:01:55:d4:55:14:f8:bc:12:3d:6c:a8
RCV:Advertised lease scored 0, toss it.

My ISP is Cox and when I called they said that from where they sit that the lease has been issued and is ready to be used.  I don't understand why the client is refusing to use it.

Thoughts?
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