Which combination of steps will meet these requirements?

Explanations:

Creating an Amazon EventBridge rule with a pattern that matches theCreateUserevent allows for monitoring the specific action of IAM user creation, which is the first step in the workflow to trigger notifications and subsequent actions.

While CloudTrail logs the events, it does not directly send notifications. Instead, notifications should be set up through EventBridge or SNS based on the CloudTrail event. Thus, this option does not contribute directly to the requirements.

Invoking a container in Amazon ECS is not necessary for removing access, and while it could theoretically perform the action, it’s not a standard or optimal method for the use case presented. Directly managing access through IAM policies or roles would be more appropriate.

Using an AWS Step Functions state machine can orchestrate the process of removing user access and facilitate approvals from the security team, ensuring a controlled flow of actions based on the IAM user creation event.

Using Amazon SNS to notify the security team is an effective way to send notifications about the user creation event and obtain the necessary approval, fulfilling the notification requirement.

Amazon Pinpoint is primarily designed for marketing campaigns and user engagement rather than direct notifications for security events, making it less suitable for notifying the security team about IAM user creation.