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Executive Summary

IAM Identity Center administrators can manage user access to AWS resources by utilizing three identity sources: the built-in Identity Center directory, Active Directory integration, or external SAML 2.0 providers like Okta. Significant updates have allowed migrations away from Active Directory to an external IdP or the Identity Center directory to preserve existing users, groups, memberships, and assignments—a key improvement over past capabilities where cutovers resulted in data deletion. While transitions between external IdPs and the Identity Center directory maintain identity store integrity, switching back to Active Directory still causes the permanent removal of these elements at the moment of cutover. A detailed runbook guides administrators through this complex process, particularly for migrating from Active Directory to Okta, emphasizing prerequisite checks like matching attributes and secure backup protocols before executing the configuration switch, SCIM provisioning, and final access validation.

Facts Only

AWS IAM Identity Center manages user access to AWS resources via Permission Set assignments or Application assignments. The three supported identity sources are the Identity Center directory, Active Directory, and external IdP (supporting SAML 2.0). Migrating from Active Directory to an external IdP preserves users, groups, memberships, and assignments; migrating back to Active Directory deletes them. Common blockers include matching attributes in the target IdP and ensuring all required user attributes are present. The migration process involves five steps: backup of current state, preparation/validation in the target source, switching the identity source (retaining SAML metadata configuration), enabling SCIM provisioning, and final access validation. A detailed runbook covers a transition from Active Directory to Okta over seven phases, including rollback procedures.

Full Take

The narrative presents identity management migration as a high-stakes technical sequence, effectively framing the process around controlled risk mitigation—a necessary pattern when dealing with core system access controls. The strength of this guidance lies in meticulously detailing how newer capabilities (preservation during AD to External IdP switch) alter the risk profile compared to older procedures. However, even preserved data requires rigorous verification; the reliance on backup scripts and post-migration drift detection highlights that "preserved" does not equal "verified." This structure implicitly assumes the actor possesses the comprehensive expertise needed across Identity Center, Active Directory, and the external IdP (e.g., Okta) simultaneously. The paradigm driving this is centralization of control versus decentralization of identity authority. Who benefits most from this complex framework? Cloud service providers by standardizing enterprise access via configurable APIs; organizations gain agility but inherit immense operational overhead in maintaining strict pre-cutover validation checklists. The unstated assumption is that the complexity itself signals governance maturity. What would change one’s perspective: realizing that any single step failure—like a mismatched attribute or certificate upload error—requires freezing functionality while manually recreating access structures? How might smaller, less technologically mature organizations absorb this detailed operational burden without dedicated identity engineering staff?
Patterns detected: none

From the original · AWS Security Blog

AWS Security Blog Managing identity source transition for AWS IAM Identity Center October 20, 2026: This post was republished to reflect the new migration capability from Active Directory to an external identity provider (IdP) or the Identity Center directory, now available in IAM Identity Center.
Read the full story at aws.amazon.com
Managing identity source transition for AWS IAM Identity Center | Huntaegis