Virtual machine UUID If you are writing a workflow and not using an automated workflow from ServiceNow, you must provide a properly formatted UUID. The VMware universal unique identifier (UUID) required by VMware activities (VM uuid input variable) must be in the following format: 4210c162-e31e-70e6-4a03-b46abbe17b4f. A UUID from another source might be in the wrong format. For example the UUID from the VMX file (uuid.bios field) on the virtual machine appears in this format, 42 10 c1 62 e3 1e 70 e6-4a 03 b4 6a bb e1 7b 4f, and produces an error. If the UUID you have for a virtual machine is not in the correct format, use one of these methods to obtain the correct value.