Looks like Microsoft is trying to be like Apple. No promises but but could try these. Microsoft is not too bright so maybe one of the below will work.
* Here’s the possible easiest way :
https://www.youtube.com/watch?v=OX-LwZZVQT4&vl=en
but maybe this is not a choice now - video from 2018.
* Have you tried factory resetting with no Internet connection so a local account is set up?
* You can try it from “Settings” while on Desktop.
* Or from shutting down three times to force Windows Startup Repair mode then select “Troubleshoot” and then “Reset this PC”
* Or booting from an install disk and select Repair, etc. as above
* Or ''some'' computers will go here by pressing <F11> key. Check manual.
Most of this process is unattended so just set them up in a big row and away you go.
Or if they are identical just reset one and clone it on to the rest of them but that might take longer.