One of the Contributor did not receive the workflow email notification who is also the Initiator (Self-Service) of the workflow.
SAP SuccessFactors Employee Central
Due to workflow configuration, Self role is been configured under Workflow Contributor.
In the associated Workflow, remove Self role under workflow Contributors and place it under CC Role such that the workflow is triggered to initiator (Self-Service).
Workflow, Initiator, Contributor, Self Service, email notification , KBA , LOD-SF-EC-WFL , Workflows - Configuration, Tools, Objects & Rules , Problem