Unable to update Service request via SCO runbook

Good afternoon, Everyone,

I’ve started developing a series of runbooks for our new service desk implementation, and one of the key requirements is the ability to automatically update Service Requests and other work items during the workflow. However, I’m running into an issue when attempting to pass the GUID of the Service Request into the “Update Object” activity.

Even though the GUID is successfully retrieved from the Service Request and passed into the runbook as an input parameter, the activity reports that the value is an invalid GUID. This suggests that either the GUID is being transformed somewhere in the process, isn’t being interpreted correctly by the activity, or the wrong property is being supplied even though the value appears correct when inspected within the runbook.

At this stage, I’m trying to determine whether the issue is caused by the way SCSM exposes the GUID, how the runbook passes the parameter, or a limitation quirk within the Update Object activity itself. Any guidance or examples of correctly updating Service Requests via runbooks especially when using GUID values dynamically would be greatly appreciated.