I've found that adding the following to dhclient.conf seems to resolve
this.  Not sure if there is a way to get this working out of the box.

/etc/dhcp/dhclient.conf
#send host-name = gethostname();
send host-name = "<serverhostname>";
# for ipv6 /dhcpdv6
send fqdn.fqdn "<serverhostname.domain.com>.";
send fqdn.encoded on;
send fqdn.server-update on;

obviously I replace <serverhostname*> with the correct hostname.  With
these settings in place the dhcpd6 server receives the correct info to
perform a ddns update.

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https://bugs.launchpad.net/bugs/1604617

Title:
  dhclient does not send fqdn.fqdn for DHCPv6

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