When using Runbook Automation Activities in SCSM workflows, the call to start the relevant runbook is made using the Orchetsrator web service to the management server. If the call to Orchestrator fails, the runbook activity will fail, and an entry will be added to the log stating ‘Runbook invocation failed because the Runbook contract has changed. See the eventlog for additional information’.   In my experience, at this point most.. Read More