Creating a stackset with cloudformation TO DEPLOY STACK IN MY MEMBERS ACCOUNT

Question

Hello, Pls i need help with sample cloudformation code on how to deploy a stack set with cloudformation i keep getinng this error below, will really appreciate a correct code and the reason i was haveing error and what i was getting wrong

**ERROR**
Properties validation failed for resource TestingStackSet20240411 with message: #: #: only 1 subschema matches out of 2 #/StackInstancesGroup/0: required key [DeploymentTargets] not found #/StackInstancesGroup/0: required key [Regions] not found #/StackInstancesGroup/0: extraneous key [StackInstances] is not permitted

**CODE**

```
  TestingStackSet20240411:
    Type: AWS::CloudFormation::StackSet
    Properties:
      StackSetName: TestingStackSet20240411
      TemplateURL: https://s3.amazonaws.com//StackSetTemplate.yaml
      Parameters:
      - {ParameterKey: BucketName, ParameterValue: TestingBucketName}
      # Tags: #[Array of Tag]
      Capabilities: #[Array of String]
      - CAPABILITY_NAMED_IAM
      PermissionModel: SELF_MANAGED #Allowed Values[SERVICE_MANAGED | SELF_MANAGED]
      AutoDeployment:
        # Describes whether StackSets automatically deploys to AWS Organizations accounts that are added to a target organizational unit
        Enabled: false
        RetainStacksOnAccountRemoval: false
      # StackInstancesGroup: #[Array of StackInstances]
      StackInstances:
      - DeploymentTargets:
          # AccountFilterType: #Allowed Values[NONE | UNION | INTERSECTION | DIFFERENCE]
          # OrganizationalUnitIds: #[Array of String]
          # AccountsUrl: [String]
          Accounts: #[Array of String]
          - !GetAtt TestingOUAccount20240411.AccountId #!RefTestingOUAccount20240411
          Regions: #[Array of String]
          - us-east-1
        ParameterOverrides: #[Array of Parameter]
        - {ParameterKey: BucketName, ParameterValue: TestingBucketName,}
```

Accepted Answer

Hello.

I think the problem is that the list is created by listing something called "StackInstances" that cannot be used in "StackInstancesGroup".  
Also, "Regions" was written to be included in "DeploymentTargets", so that has also been corrected.  
So I think you can use it by modifying it as follows.  
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-resource-cloudformation-stackset.html#cfn-cloudformation-stackset-stackinstancesgroup  
```
  TestingStackSet20240411:
    Type: AWS::CloudFormation::StackSet
    Properties:
      StackSetName: TestingStackSet20240411
      TemplateURL: https://s3.amazonaws.com//StackSetTemplate.yaml
      Parameters:
      - {ParameterKey: BucketName, ParameterValue: TestingBucketName}
      # Tags: #[Array of Tag]
      Capabilities: #[Array of String]
      - CAPABILITY_NAMED_IAM
      PermissionModel: SELF_MANAGED #Allowed Values[SERVICE_MANAGED | SELF_MANAGED]
      AutoDeployment:
        # Describes whether StackSets automatically deploys to AWS Organizations accounts that are added to a target organizational unit
        Enabled: false
        RetainStacksOnAccountRemoval: false
      StackInstancesGroup:
        - DeploymentTargets:
            # AccountFilterType: #Allowed Values[NONE | UNION | INTERSECTION | DIFFERENCE]
            # OrganizationalUnitIds: #[Array of String]
            # AccountsUrl: [String]
            Accounts: #[Array of String]
              - !GetAtt TestingOUAccount20240411.AccountId #!RefTestingOUAccount20240411
          Regions: 
            - us-east-1
        ParameterOverrides: #[Array of Parameter]
        - {ParameterKey: BucketName, ParameterValue: TestingBucketName,}
```

Creating a stackset with cloudformation TO DEPLOY STACK IN MY MEMBERS ACCOUNT

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