Brian
Thanks a lot for the suggestions. It is quite random which machines that are offline, so it is not really possible to manage them in such an active way.
The machines are actually shut down, not just offline from the SEPM. People are traveling extensively for work and their machines in the office are then shut down.
I also have a few "hot desks" and visitor desks with machines which might be shut down for longer periods.
Greg
Many thanks for highlighting this known bug. I am using 12.1.5 as well. I'll look into the workaround if this is something I want to test out.