What happens to existing AWS IAM users when enable IAM Identity Center?

Question

I want to enable IAM Identity Center and configure an external IdP for an existing AWS account. This AWS account already has users, created with IAM.
What happens to these users?

I'm especially worried about users used by my application to, for example, access S3 buckets. They have no password but only an access key and secret. Will these users' keys work after the configuration of the external IdP?

Thanks

Answer

Hi There

Nothing will happen to the existing IAM users and access keys when you deploy IAM Identity Center and federate with an external IdP.  THey can co-exist.

See https://repost.aws/questions/QUfNomVCt5TCiac7oQoT8n0A/can-i-keep-existing-iam-users-and-add-sso-to-our-accounts

Answer

Hi Matt, thank you for the answer.
So my application will still work even after the IdP configuration, great.

But in the `Review and confirm` step of the configuration, I saw this point:

> IAM Identity Center preserves your current users and groups, and their assignments. However, only users who have usernames that match the usernames in your identity provider (IdP) can authenticate.

This affect only users with a password?

Thank you

What happens to existing AWS IAM users when enable IAM Identity Center?

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