how to add offline Agent to a Machine Group

Hello,

we organized our Workstations based ob departments from our company.  So we basicly created multiple machine groups wich are linked with OUs from our domain.

Now we are facing the followin issure:

We are not able to add systems which are currently offline/powered off.

When we try for example an enerygy status scan we can see the new System in the result list (with the status - system not found).
But when we change the view to the machine groups we notify that the system not added to the group.

So what can we do to add offline/powered off machines to its machine groups without powering on.