My stacks are failing

There can be several reasons why your CloudFormation stacks are failing. Without more specific information about the failure, I can provide some general insights and troubleshooting steps:

1. Insufficient permissions: Your account may lack the necessary permissions to create the resources specified in the template.

2. Template errors: The CloudFormation template might contain errors. It's advisable to validate the template before creating the stack.

3. Resource limits: You may have reached the maximum number of a particular resource allowed in your account.

4. Global resource conflicts: The template might be trying to create global resources (like S3 buckets) that must be unique but aren't.

5. Account issues: The specified target account number might not exist or there could be problems with trust relationships between accounts.

To determine the specific cause of your stack failure:

1. Open the AWS CloudFormation console.
2. Find and select your failed stack.
3. Go to the "Events" tab.
4. Look for the "Detect root cause" option. CloudFormation will analyze the failure and highlight the event that is likely the root cause.
5. Check the "Status reason" for a detailed explanation of the failure.

If you need more information, you may be able to view related CloudTrail events, depending on your permissions. These events can provide additional details about the failure.

For a more advanced troubleshooting option, AWS CloudFormation now offers AI-powered assistance through Amazon Q Developer. This feature can provide an easy-to-understand analysis of the error and suggest actionable steps to resolve common resource provisioning issues.

By following these steps and utilizing the available tools, you should be able to identify the cause of your stack failure and take appropriate steps to resolve it.
Sources
Troubleshooting AWS CloudFormation StackSets - AWS CloudFormation
Determine the cause of a stack failure - AWS CloudFormation
Accelerate AWS CloudFormation troubleshooting with Amazon Q Developer assistance - AWS

Looks like the stack is failing to delete and you want to know how to delete it. From the error, you have an output as an export "TransCapacityManagementService-Events-Gamma-NA" which is being used in another template. As a result you cannot delete the stack.

To find out where this export is getting used, you can write a CLI command.

aws cloudformation list-exports \
  --query "Exports[?Name=='TransCapacityManagementService-Events-Gamma-NA'].ExportingStackId" \
  --output text