Sometimes, for any number of reasons, the Identity Governance workflow is halted and needs to be started again.
This Knowledge document deals with how to do that.
How to restart halted workflows in Identity Governance Workflow.
Open the Workpoint Designer.
Open the workflow in question (you can find the WPDS ID from the workflows screen in Identity Governance)
Click on the node where the workflow got stuck, it opens a menu that offers the choice reset (the node).