I am having issues using on.workflow_call.inputs. I tried using the example from GitHub Docs, Workflow syntax for GitHub Actions - GitHub Docs, and this also failed. The workflow is provided below:

name: "Test Inputs"
on:

push:

workflow_call:

inputs:

username:

description: 'A username passed from the caller workflow'

default: 'john-doe'

required: false

type: string
jobs:

print-username:

runs-on: ubuntu-latest
steps:
  - name: Print the input name to STDOUT
    run: echo The username is ${{ inputs.username }}

This workflow only prints The username is when it should be The username is john-doe. I have also tried ${{ github.event.inputs.username }} and ${{ INPUT_USERNAME}}. Any help would be appreciated. Thank you!