What could cause no Network Interfaces visible in installing a new host?

I have added a new host to oVirt 4.3.10, the initial SSH installs all the packages (all with failed=0 in host-deploy/*log). The installation is shown as failed without any meaningful message.

However the Network Interfaces page is blank, what could cause this?

Host in CentOS 7.8 tried with/without biosdevname.