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Hello Durgesh !
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This behavior can happen with Entra ID Staged Rollout and is usually related to propagation.
Even when the group is synced and users are direct members changes to a Staged Rollout group can take up to 24 hours to take effect. It is better using cloud security groups for staged rollout where possible to avoid onprem AD group sync latency.
When a user is added to a Staged Rollout group, the transition from federated to managed authentication may complete after the user performs another interactive signin. Similarly, when a user is removed from the Staged Rollout group, they may continue to use managed authentication until they complete another interactive signin after which federation is applied again.
Staged Rollout applies to browser and modern authentication scenarios. Some flows can still use federation, for example:
- legacy authentication clients
- apps sending a domain_hint
- certain Windows/PRT scenarios
- devices using cached sessions
So it is possible for the same user to appear as managed in one test and still redirect to AD FS in another app/client scenario.
You can test with an inprivate browser session and go directly to:
Enter the user UPN manually then check the Microsoft Entra sign-in logs for that user to confirm whether the authentication path is federated or cloud-managed.