Cloudformation error: Property validation failure: [Encountered unsupported properties in {/}: [UserData]]

Question

Been trying to create a cloud formation template. I have been trying to use the UserData section and have reduced the template to the bones to identify what the problem is:

I am getting the error: Property validation failure: [Encountered unsupported properties in {/}: [UserData]]

This is my now totally barebones template. I must be doing something fundamentally wrong. Can someone help please?

    {
    "AWSTemplateFormatVersion": "2010-09-09",
    "Metadata": {
        "AWS::CloudFormation::Designer": {
            "319ac38d-a9ea-4855-9a9a-4dc91f6ef092": {
                "size": {
                    "width": 60,
                    "height": 60
                },
                "position": {
                    "x": -310,
                    "y": 30
                },
                "z": 1,
                "embeds": []
            }
        }
    },
    "Resources": {
        "Cloud9Template": {
            "Type": "AWS::Cloud9::EnvironmentEC2",
            "Properties": {
                "UserData":{
                    "Fn::Base64" : {
                        "Fn::Join" : [ ",", [
                            "test",
                            "Hello World" ] ]
                    }
                },
                "AutomaticStopTimeMinutes": "45",
                "InstanceType": "t2.micro",
                "Name": {
                    "Ref": "AWS::StackName"
                }
            },
            "Metadata": {
                "AWS::CloudFormation::Designer": {
                    "id": "319ac38d-a9ea-4855-9a9a-4dc91f6ef092"
                },
                "AWS::CloudFormation::Init" : {
                    "sources" : {
                      "/home/ec2-user/environment/src" : <linktotarball>"
                    }
                }
            }
        }
    }
}

Thank you!

Answer 1

Unfortunately, AWS::Cloud9::EnvironmentEC2 does not support UserData as shown in its documentation.

In other words, you can't use UserData in the definition of EnvironmentEC2 resource.