yaml - Azure DevOps : ${{ parameters.Key }} and ${{ parameters.Value }} returning nothing

Question

I just now tried executing the sample pipeline provided here and the echo of ${{ parameters.Key }} and ${{ parameters.Value }} is printing out nothing. I'm sure I've tried something like the following in the past and it did work. Might it be a regression?

parameters:
- name: param_1
  type: string
  default: a string value
- name: param_2
  type: string
  default: default
- name: param_3
  type: number
  default: 2
- name: param_4
  type: boolean
  default: true

steps: 
- ${{ each parameter in parameters }}:
  - script: echo '${{ parameters.Key }} -> ${{ parameters.Value }}'

question from:https://stackoverflow.com/questions/65904079/azure-devops-parameters-key-and-parameters-value-returning-nothi

Answer 1

Please use ${{ parameter.Key }} -> ${{ parameter.Value }} instead of ${{ parameters.Key }} -> ${{ parameters.Value }}.

This works on my side:

parameters:
- name: param_1
  type: string
  default: a string value
- name: param_2
  type: string
  default: default
- name: param_3
  type: number
  default: 2
- name: param_4
  type: boolean
  default: true

steps: 
- ${{ each parameter in parameters }}:
  - script: echo '${{ parameter.Key }} -> ${{ parameter.Value }}'

Result: