Thanks Burningstone. I installed HA on my Pi using the 64-bit RPi image downloaded and flashed to an SD card. So, I’m running the latest HASSOS 4.11 image (actually, I flashed an older version a few months ago, and have been upgrading in situ to this latest version).
I found this guide, but I couldn’t find that nmcli command, so assume it is not available in the canned install version of HASSOS.