Need access to the REST API for IdP Federation
Currently all IdP federation set up must be done in the Atlas GUI. This prohibits scripting the setup of IdP organization and role mapping for new projects.
Customers can prefer setting this up via a scriptable Rest API interface for a new project. Everything else about the project has an API that is currently used to create projects and deploy clusters. Authentication is important part of the process and currently requires manual set up through the GUI.

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AdminFuat (Admin, MongoDB) commented
This feature is currently supported; please refer to the API specification https://www.mongodb.com/docs/atlas/reference/api-resources-spec/#tag/Federated-Authentication and the feedback item
https://feedback.mongodb.com/forums/924145/suggestions/42189094(Edited by admin)