Hi Dale,
Have you enabled the DHCP servoce for host inbound traffic on the zone?
Based upon the outputs I am not able to see DHCP service enabled. You can enable DHCP service by the below command and then test
# set security zones security-zone <zone name>interfaces <interface name> host-inbound-traffic system-services DHCP
Please provide me with the output of the below command :
# run show system services dhcp statistics
Also refer this KB article and compare the configuration:
# https://kb.juniper.net/InfoCenter/index?page=content&id=KB21909&actp=search
Regards,
Rishi