A Security Engineer signed in to the AWS Management Console as an IAM user and switched to the security role IAM role. To perform a maintenance operation, the S...

A Security Engineer signed in to the AWS Management Console as an IAM user and switched to the security role IAM role. To perform a maintenance operation, the Security Engineer needs to switch to the maintainer role IAM role, which lists the security role as a trusted entity. The Security Engineer attempts to switch to the maintainer role, but it fails.
What is the likely cause of the failure?