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06/07/2026 9:42 am
TL;DR: Session migration lets applications swap identity providers without forcing users to log in again by validating legacy tokens and issuing new sessions, according to Descope. The deeper issue is that migration programmes fail when they assume sessions, signing keys, and token lifecycles will align across systems; they rarely do.
NHIMG editorial — based on content published by Descope: Session Migration: Switch IDPs Without Disrupting Users
Questions worth separating out
Q: How should teams migrate active sessions without forcing users to log in again?
A: Teams should validate the legacy session, map it to the correct user, and issue a fresh token under the new provider while both validation paths remain available for a controlled transition.
Q: Why do IdP migrations so often cause lockouts and support spikes?
A: Because the new identity provider usually cannot trust the old provider's session tokens without an exchange bridge.
Q: What do security teams get wrong about migrating API keys and access keys?
A: They often treat machine credentials like simple session replacements, when in reality those keys may be embedded in many services, jobs, and automations.
Practitioner guidance
- Map session trust boundaries before cutover Document issuer, signing key, claim, and expiry differences between the old and new identity providers, then test how each application handles both token types during the transition.
- Define a time-bounded dual-validation period Allow both legacy and new session tokens only for the migration window, then remove the legacy validation path once the overlap is complete and monitored.
- Include machine credentials in migration governance Inventory API keys, access keys, and dependent services before importing anything into the new platform, and decide which credentials should be migrated versus retired.
What's in the full article
Descope's full post covers the operational detail this post intentionally leaves for the source: the token exchange flow, SDK integration steps, and configuration choices for phased IdP migration.
- SDK-level implementation guidance for React, Next.js, WebJS, Kotlin, and Swift integrations.
- The backend dual-validation pattern used to accept both legacy and new session tokens during transition.
- Operational examples for mobile apps, enterprise phased rollouts, and vendor transitions that need uninterrupted access.
- API key migration mechanics for importing existing access keys without breaking dependent services.
👉 Read Descope's session migration guidance for uninterrupted IdP changeovers →
Session migration for IdP changes: are your controls ready?
Explore further
06/07/2026 9:58 am
Session continuity is the hidden dependency in IdP migrations. Migration projects are usually framed as backend modernization, but the real risk sits in the trust assumptions behind active sessions. When providers differ on issuer, key material, and token lifetime, a cutover can turn into a mass reauthentication event that breaks both user trust and operational continuity. Practitioners should treat session preservation as a first-class migration requirement, not a post-cutover convenience.
A few things that frame the scale:
- From our research: The average estimated time to remediate a leaked secret is 27 days, despite 75% of organisations expressing strong confidence in their secrets management capabilities, according to The State of Secrets in AppSec.
- Only 44% of developers are reported to follow security best practices for secrets management, exposing a significant developer behaviour gap.
A question worth separating out:
Q: Who is accountable when dual token validation becomes a permanent exception?
A: The identity and platform owners are accountable, because dual validation is meant to be a temporary bridge during cutover. If both token models remain active indefinitely, the organisation has created overlapping trust paths that weaken governance and make it harder to prove which session state is authoritative.
👉 Read our full editorial: Session migration exposes the real gap in IdP changeovers
