AWS Control Tower failed to set up your landing zone completely: AWS Control Tower is unable to update stack arn:aws:cloudformation:us-east-2:account-id:stack/AWSControlTowerBP-BASELINE-CLOUDTRAIL-M

The issue occurs due to several potential issues during the setup process of AWS Control Tower. To troubleshoot and resolve this, consider the following common causes:

1. CloudFormation Stack Failure

First, review the CloudFormation stack associated with the error (AWSControlTowerBP-BASELINE-CLOUDTRAIL-M) in the AWS CloudFormation console. Examine the stack events to pinpoint the exact failure point. This can help identify whether the issue is related to a specific resource conflict, permission issue, or misconfiguration. Be sure to check the stack status and the associated logs for more detailed insights.

2. IAM Role or Permission Issues

AWS Control Tower relies on several IAM roles with specific permissions to provision and update resources. Ensure that the required roles, such as AWSControlTowerExecution, have the correct permissions to perform actions related to CloudTrail. Inadequate permissions or misconfigured roles could prevent the stack from updating successfully.

3. Cross-Account Access Issues

If you are working within a multi-account environment, it’s important to ensure that cross-account permissions are properly configured. This includes making sure that the necessary roles are able to assume access across the different AWS accounts involved in your Control Tower setup. Any gaps in these permissions can cause stack updates to fail.

4. Service-Linked Roles

AWS Control Tower depends on service-linked roles, such as AWSServiceRoleForCloudTrail, to manage and deploy resources for services like CloudTrail. If any of these roles were accidentally modified or deleted, it could cause issues during the landing zone setup. Verify that all required service-linked roles are present and correctly configured.

5. S3 Bucket Permissions for CloudTrail

CloudTrail often uses S3 buckets to store logs, and improper S3 bucket permissions can interfere with its ability to write logs. Verify that the S3 bucket permissions and policies are appropriately configured, and ensure that there are no overly restrictive settings that might prevent CloudTrail from logging events as expected.

6. Resource Conflicts or Stack Corruption

Occasionally, a previous setup attempt or a deleted stack can leave resources in an inconsistent or corrupted state. Check for any orphaned resources or incomplete configurations that may need to be cleaned up before proceeding. If such resources are found, consider manually deleting them and retrying the setup process.

For a comprehensive list of potential issues and troubleshooting steps, AWS provides detailed documentation on resolving AWS Control Tower setup failures. Please refer to the official AWS Control Tower Troubleshooting Guide.

Next Steps:

1. After addressing the potential issues outlined above, retry the setup process in AWS Control Tower.