I have an azurePipeline that have some parameters defined in a template file called
alerts-parameters.yml

parameters:
  alerts:
    - alertName: 'ex1'
    - alertName: 'ex2'
    - alertName: 'ex3'

In the pipeline I am defining the parameters as template under variables and iterating on those parameters and execute simple pipeline but it’s not able to identify the alerts to iterate on it.

azurePipeline.yml

variables:
  - template: alerts-parameters.yml


jobs:
  - job: ValidateAlert
    displayName: 'ValidateAlert'
    pool:
      vmImage: 'ubuntu-latest'
    steps:
    - ${{ each alert in parameters.alerts }}:
      - task: AzureCLI@2
        displayName: 'Validate Alert: ${{ alert.alertName }}'
        inputs:
          azureSubscription: $(ResourceGroup)
          scriptType: 'bash'
          scriptLocation: 'inlineScript'
          inlineScript: |
            echo "Validating alert: ${{ alert.alertName }}"

Azure pipeline error
/azurePipeline.yml (Line: 10, Col: 7): Key not found 'alerts'

N.B: It works if the parameters are defined in the same AzurePiplien file but I am trying to add those parameters in another template file as they are huge (this is simplified example)

Working Example:

parameters:
  - name: alerts
    type: object
    default: 
      - alertName: 'ex1'
        alertParam: '1'
      - alertName: 'ex2'
        alertParam: '2'
      - alertName: 'ex3'
        alertParam: '3'

jobs:
  - job: ValidateAlert
    displayName: 'ValidateAlert'
    pool:
      vmImage: 'ubuntu-latest'
    steps:
    - ${{ each alert in parameters.alerts }}:
      - task: AzureCLI@2
        displayName: 'Validate Alert: ${{ alert.alertName }}'
        inputs:
          azureSubscription: $(ResourceGroup)
          scriptType: 'bash'
          scriptLocation: 'inlineScript'
          inlineScript: |
            echo "Validating alert: ${{ alert.alertName }}"