creating a 'Target' for a cloudwatch event rule via cloudformation for a fargate launchtype task

Question

I'm trying to create a scheduled task (CloudWatch Events Rule) in my CloudFormation Template that would have the following EcsParameters:

EcsParameters:
        LaunchType: FARGATE
        NetworkConfiguration: 
          AwsVpcConfiguration:
            AssignPublicIp: !Ref PublicIpAssignment
            SecurityGroups:
              - !Ref EcsSecurityGroups
            Subnets:
              - !Ref SubnetName
        TaskCount: 1
        TaskDefinitionArn: !Ref TaskDefinitionOne

My ECS CLuster is launched on Fargate and not EC2, and I do NOT have a service running (use case doesn't need a long running process, directly scheduling tasks from events rules.)

Whenever I run this template (with LaunchType and NetworkConfiguration) the stack creation fails, with this error:

Encountered unsupported property NetworkConfiguration

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As an alternative, I also tried launching the scheduled task from AWS CLI, but it seems like the network config and launch type options are not available there either:

Parameter validation failed: Unknown parameter in Targets[0].EcsParameters: "LaunchType", must be one of: TaskDefinitionArn, TaskCount

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According to this page on the AWS Documentation itself, I should be able to specify LaunchType and NetworkConfiguration in my EcsParameters section in Targets in Properties of the AWS::Events::Rule resource.

Is there anything I can try that might work?

Answer 1

Even though AWS hasn't updated the documentation by today (Jul.15, 2019) it's working as described by the initial poster.