Dell Command Update 4.6.0+ does not work in SCCM OSD Task Sequence

In an SCCM Operating System Deployment Task Sequence I install DCU and then use dcu-cli to do some "stuff".

As of v4.6.0, and including v4.7.1 some of these things I'm trying to do don't work.

For example, trying to configure the BIOS Password for DCU fails with code 2.

Running the command outside of the OSD task sequence works fine. It just won't work in the OSD task sequence.

Other people have been having this problem, and it seems like it has been cropping up in some previous versions of DCU too, see https://www.reddit.com/r/SCCM/comments/xfg8of/dell_command_update_return_code_2/ 

I can only assume some kind of code regression has taken place. Can anyone from Dell please take a look at this?