In case if in the system does not exist an interface with primary IP address in DHCP network, DHCP configuration script fails with the next message:

None of the DHCP lease subnets are inside any configured subnet on
broadcast interfaces. At least one lease subnet must be set such that
DHCP server listens on a one broadcast interface!

This message does not indicate clearly that IP address must be primary on an interface. We need to rephrase it to be more unambiguous.