Control Tower setup failures.

AWS Control Tower setup failures can occur due to various reasons, affecting the process of setting up and managing your multi-account environment. Here are some common causes and steps to address Control Tower setup failures:

1. Review Initial Account Configuration:
   • Verify that the initial AWS account that you used to set up Control Tower has the necessary permissions and meets the prerequisites outlined in the Control Tower documentation.
2. Check Organizational Units (OUs):
   • Confirm that the OUs created during the setup process are correctly configured and contain the expected accounts.
3. Verify Service Role Permissions:
   • Ensure that the service roles (such as AWSControlTowerExecution, and AWSControlTowerStackSetRole) have the required permissions and policies attached.
4. Review SCPs and Service Catalog Products:
   • Check if any Service Control Policies (SCPs) or Service Catalog products specified during setup are causing conflicts or errors.
5. Inspect CloudFormation Stacks:
   • Access the AWS CloudFormation console to review the status of the Control Tower stacks. Look for any failed or rolled-back stacks.
6. Check for Resource Conflicts:
   • Verify that there are no conflicts with existing resources in your AWS accounts that might be preventing Control Tower setup.
7. Review Networking Configurations:
   • Confirm that VPCs, subnets, route tables, and other networking resources are properly configured and accessible.
8. Monitor for AWS Service Health Issues:
   • Check the AWS Service Health Dashboard for any reported issues with the Control Tower service or its dependencies.
9. Inspect AWS CloudTrail Logs:
   • Analyze CloudTrail logs to identify any specific errors or events related to the Control Tower setup.
10. Verify Identity and Access Management (IAM) Policies:
    • Review IAM policies attached to roles and users involved in the Control Tower setup process to ensure they have the necessary permissions.
11. Consider Retry and Rollback:
    • Depending on the specific failure, you may need to retry the setup process or perform a rollback to a previous state.
12. Regularly Review Setup Logs:
    • Periodically review setup logs and events to identify any issues or failures that might have occurred after the initial setup.
13. Set Up AWS Config Rules:
    • Configure AWS Config rules to monitor and enforce compliance with best practices and security requirements.
14. Contact AWS Support:
    • If you've gone through these steps and are still experiencing setup failures, consider reaching out to AWS Support for further assistance.

Remember to also refer to the AWS Control Tower documentation and best practices for guidance specific to setting up and managing your multi-account environment.