A. In each account, create a set of dedicated IAM users. Ensure that all users assume these IAM users through federation with the existing IdP.
B. Deploy an IAM role in a central identity account. Allow users to assume the role through federation with the existing IdP. In each account, deploy a set of IAM roles that match the desired access patterns. Include a trust policy that allows access from the central identity account. Edit the permissions policy for the role in each account to match user access requirements.
C. Enable AWS IAM Identity Center. Integrate IAM Identity Center with the company’s existing IdP. Create permission sets that match the desired access patterns. Assign permissions to match user access requirements.
D. In each account, deploy a set of IAM roles that match the desired access patterns. Create a trust policy with the existing IdP. Update each role’s permissions policy to use SAML-based IAM condition keys that are based on user access requirements.