Mohammed Sajid 12/18/2025

Snowflakes and Claims – Custom Authentication Extension in Entra ID

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This technical tutorial explains how to implement a Custom Authentication Extension in Microsoft Entra ID. It provides a step-by-step guide, including sample code, to create a custom claims provider that fetches user attributes from external systems (like databases or HR systems) and injects them into security tokens during the login flow.

Snowflakes and Claims – Custom Authentication Extension in Entra ID

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