@Hristo Patsev Thank you for reaching out to us, As per our documentation - https://learn.microsoft.com/en-us/entra/identity/saas-apps/sap-successfactors-inbound-provisioning-cloud-only-tutorial#part-1-add-the-provisioning-connector-app-and-configure-connectivity-to-successfactors:~:text=Part%201%3A%20Add%20the%20provisioning%20connector%20app%20and%20configure%20connectivity%20to%20SuccessFactors tenant url should be without http or https.
Also you can refer to this doc from SAP - https://help.sap.com/docs/identity-provisioning/identity-provisioning/sap-successfactors see if it helps.
Reviewed our demo setup at our end, tenant url is configured below way (sharing it for reference)
Let me know if this helps or not, feel free to post back.