A. The security role and the maintainer role are not assigned to the IAM user that the Security Engineer used to sign in to the account.
B. The Security Engineer should have logged in as the AWS account root user, which is allowed to assume any role directly.
C. The maintainer role does not include the IAM user as a trusted entity.
D. The security role does not include a statement in its policy to allow an sts:AssumeRole action.

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