Amazon managed policy: KafkaServiceRolePolicy - Amazon Managed Streaming for Apache Kafka
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Amazon managed policy: KafkaServiceRolePolicy

You can't attach KafkaServiceRolePolicy to your IAM entities. This policy is attached to a service-linked role that allows Amazon MSK to perform actions such as managing VPC endpoints (connectors) on MSK clusters, managing network interfaces, and managing cluster credentials with Amazon Secrets Manager. For more information, see Service-linked roles for Amazon MSK.