SSO using O365 app, need to know API to be taken from IDCS cloud or from Cx cloud

Summary:

We are enabling single sign on using O365 app, need clarification on API whether to be taken from IDCS or from Cx cloud,

https://docs.oracle.com/en/cloud/paas/identity-cloud/idcsc/office365.html#Configuring-Office-365-in-Oracle-Identity-Cloud-Service

 

https://docs.oracle.com/en/cloud/saas/sales/oscus/oracle-applications-cloud-as-the-single-sign-on-sso-service.html#s20069736