There are all kinds of things out there, but it needs to be implemented into these vast complex organizations with all these different requirements. And that stuff is done mostly by big corporate system integrators.

Perhaps Nostr can make things easier by allowing someone to just build whatever app is recuired for a usecase, and be interoperable with any system/organization.

But the organizations that try FOSS andor Europe based stuff currently report that they dont have feature parity with microsoft.