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Add User Federated Identity Credential (user_fic) grant type support (#918)

* First draft of FIC support

* Small fixes and feedback

* PR feedback

* PR feedback

* Add integration tests

* Adjust SNI behavior around .pfx files

* Revert pfx changes and disable tests
A
Avery-Dunn committed
08aa7fd273e93933617e74be842da15d3e36bf25
Parent: d4f58ec
Committed by GitHub <noreply@github.com> on 5/20/2026, 9:53:53 PM