AWS::Config::ConfigurationAggregator - Your request does not specify any regions.

[prerna-p]

According to documentation for AWS::Config::ConfigurationAggregator, specifically the data structure AccountAggregationSource mentions that AllAwsRegions and AwsRegions are optional properties. Why does the following template still fail?

Description: "This template creates a ConfigurationAggregator for all regions."

Resources:
  CloudFormationConfigurationAggregator:
    Type: AWS::Config::ConfigurationAggregator
    Properties:
      ConfigurationAggregatorName: CloudFormationAggregator
      AccountAggregationSources:
        - AccountIds:
            - !Sub "${AWS::AccountId}"
      Tags:
        - Key: "tagKey"
          Value: "tagValue"
Outputs:
  ResourceId:
    Value: !Ref CloudFormationConfigurationAggregator

Error:

Resource handler returned message: "Invalid request provided: Your request does not specify any regions. 
Select AWS Config-supported regions and try again. 
(Service: Config, Status Code: 400, Request ID: d5a1ff66-e096-44bb-8aea-743bbad94cc9, Extended Request ID: null)" (RequestToken: 633cb76f-4633-31a3-513e-a095379def44, HandlerErrorCode: InvalidRequest)

No errors thrown on using cfn-lint either