AWS::CloudFormation::StackSet does not support AccountFilterType of UNION

[Conklin-Spencer-bah]

The example below does not work due to a bug in cloudformation stack sets. I have opened an AWS case to address the issue but also creating this for awareness.

Caused by: https://github.com/aws-cloudformation/aws-cloudformation-resource-providers-cloudformation/issues/100

    additionalAccounts: [
      '1234567'
    ],
    organizationalUnits: [
      ou-12345
    ],
    parameterOverrides: {},
  }),