It seams UndoDeprovison is not possible in a work flow when you have Quest Change auditor integration.
See this KB for details: UndoDeprovision with Workflow fails with error "Specified method is not supported" if Change Auditor Deprovision policy is applied on the Container/OU (266028).
This issue has existed for several years and still no fix. Is anyone using any kind of work around? I tried using a script in UndoDeprovision that sets the edsvaUnDeprovision to 1 and that gets the same error. I need to have this UndoDeprovision in a work flow and am stuck...