Debian preseed: How to force prompt for hostname and domain?

I have a preseed file which works perfectly in that the install goes from start to finish fully automated without prompts. However, I want to force a prompt for hostname and domain. I have tried adding: d-i netcfg/get_hostname seen false d-i netcfg/get_domain seen false However the installer just ignores this and I end up with a system with the default debian hostname etc. netcfg/get_hostname, d-i netcfg/dhcp_hostname and netcfg/get_domain are **not** defined in my preseed file. If it makes any difference, this question relates to Debian 10.