After upgrading System Center Orchestrator from 2012 RTM to 2012 SP1 and also the System Center integration packs including System Center Operations Manager 2012 SP1 Integration Pack I realized that the monitor setting entry has changed.
I have a small runbook that shows this. The first activity only translates a netbios servername to a FQDN and the second activity sets the maintenance in SCOM.
The Start Maintenance Mode activity looked like this before the upgrade to SP1:
The Monitor entry had a format like this: Microsoft.Windows.Computer:ServernameFQDN to set the whole server into maintenance.
After upgrade to SP1 you get the following error.
So it does not find the monitor anymore.
Change the activity to this:
The monitor entry needs to have this format now:
ServernameFQDN : Microsoft.Windows.Computer:ServernameFQDN
Now it should run successful.