post
https://{hostname}/crux/v1/mgmt-pop/appidp
Assigns an existing IdP to an application. An application can have only one IdP, so the request fails with a 400 error if the application already has one. To replace it, unassign the existing IdP first. To unassign IdPs in bulk from an application, set the method parameter to DELETE. To remove an assignment, populate the deleted_objects array in the request body with the app-IdP association uuid_url values.
