Managing Maintenance Window Tasks using {{RESOURCE_ID}}

Question

I have a SSM Maintenance Window with instance targets linked via a Resource Group.
So the tasks associated with this Maintenance Window make use of the {{RESOURCE_ID}} parameter.
Applying the {{RESOURCE_ID}} to a task which calls an AWS document works fine. Such as AWS-StartEC2Instance and AWS-StopEC2Instance. 
I'm now trying to use the {{RESOURCE_ID}} with a new document which executes a powershell script. When i build a new document there is the option to specify the "InputPayload" which i am setting as " InstanceIds : "{{RESOURCE_ID}}", but when i execute the document i get the error...

" Step fails when it is validating and resolving the step inputs. Failed to resolve input: RESOURCE_ID to type Integer or Boolean or String or StringList or StringMap or MapList. RESOURCE_ID is not defined in the Automation Document "

The document content looks like this....

description: TEST
schemaVersion: '0.3'
mainSteps:
  - name: Main
    action: 'aws:executeScript'
    inputs:
      Runtime: PowerShell Core 6.0
      Script: |-
        Write-Host 'hello world'; 
        $inputPayload = $env:InputPayload | ConvertFrom-Json; 
        <#$parameter = $inputPayload.events.parameter;#> 
        Write-Host $inputPayload.context; 
        return @{message='hello'}
      InputPayload:
        InstanceIds: '{{RESOURCE_ID}}'

Any ideas where i'm going wrong with this?

the_screen_sl4ver · Answer

You didn't specify what kind of Powershell script you were executing, or how you planned on executing the SSM document.  (guessing a maintenance window?).  The error you received states the input 'RESOURCE_ID' was never specified.  I couldn't make much sense of your document content with the error.  But, your fix is here -- > https://docs.aws.amazon.com/systems-manager/latest/userguide/automation-action-executeScript.html

Managing Maintenance Window Tasks using {{RESOURCE_ID}}

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