References:
The last configuration to be done before you can access an OAuth 2.0 protected OData service is to activate the token issuer service. To be able to access a resource, your OAuth client needs to have an access token. This token is issued by SAP NetWeaver ABAP. The token service is available as an HTTP service and must be activated.
Activate ICF nodes for OAuth
Tx: SICF
Activate /sap/bc/sec/oauth node and sub nodes.
ICF Node: /sap/bc/sec/oauth
