Use the SB (self-service) approval procedure to approve requests automatically. You do not have to specify approvers for this approval procedure. A self-service request is always granted immediate approval. Always define an approval workflow with the approval procedure SB as a one-step workflow. That means you cannot set up more approval steps in addition to a self-service approval step.
The approval workflow and the Self-service approval policy are available by default and assigned to the Identity & Access Lifecycle shop.