Not all possible DHCP scope options are available in IPAM.
All IPAM versions
This occurs when the DHCP server has custom scope options configured.
Configure the DHCP server with standard scope options. IPAM supports the majority of DHCP scope options defined within the RFC 2132 standard. A list of the options specific in this RFC are available in https://www.ietf.org/rfc/rfc2132.txt.