Okta has a SAP SuccessFactors app already defined that makes it very easy to setup SSO with SAP SuccessFactors when using Okta as the Identity Provider.
For more details on the setup, you can also reference my Okta SSO Blog. You ca also access my other 3DR blogs from this link.
https://www.youtube.com/watch?v=zUjOU8njxM0&t=694s