Azure DevOps Pipeline failing to find registered variable in Deployment Job

azure-pipelines.yaml

---
# I am attempting to create a ServiceNow Change Request, register the sys_id to a pipeline var, then use it in
# subsequent steps in the pipeline. I want to use a Deployment Job because it allows me to track uses of the
# environment and pipeline for auditing. Then I can also stick on other "security" mechanisms or gating
# mechanisms to prevent unwanted usage.
# I also wanted to use a Deployment Job because it seemed to allow for the breaking of and catching of failed
# steps. However, it's proving to be more difficult than it really should be and is very unintuitive.
# The Azure DevOps Pipelines documentation has changed a lot and is now missing pieces of docs that were once
# there.
trigger: none

pool:
  vmImage: ubuntu-latest

variables:
  - group: 'ServiceNow Values'

stages:
  - stage: BuildAndPublishStage
    displayName: Build and Publish
    jobs:
      - job: BuildAndPublishJob
        displayName: Build and Publish
        workspace:
          clean: all
        steps:
          - task: Bash@3
            displayName: Install Poetry
            inputs:
              targetType: inline
              script: |
                curl -sSL https://install.python-poetry.org | python -
            env:
              POETRY_HOME: '/opt/poetry'
          - task: Bash@3
            displayName: Build and Publish
            inputs:
              targetType: inline
              script: |
                /opt/poetry/bin/poetry install
                /opt/poetry/bin/poetry build
                /opt/poetry/bin/poetry publish \
                  --verbose \
                  --username azure \
                  --password $(System.AccessToken) \
                  --repository azure

  - stage: TestInstallStage
    displayName: Test the install
    jobs:
      - job: TestInstallJob
        displayName: Test the install
        workspace:
          clean: all
        steps:
          - task: Bash@3
            displayName: Install ServiceNow
            inputs:
              targetType: inline
              script: |
                pip install snow --index-url=https://azure:$(System.AccessToken)@pkgs.dev.azure.com/$(ADO_ORG)/$(ADO_PROJ)/_packaging/python-azure-artifacts/pypi/simple/
                servicenow --help
          - task: Bash@3
            displayName: Run ServiceNow
            inputs:
              targetType: inline
              script: |
                servicenow --help

  - stage: DeployToProductionStage
    displayName: Production Deployment
    condition: eq(variables['PhilIsGreat'], 'true')
    jobs:
      - deployment: BuildPythonApp
        displayName: Build Python App
        environment: PhilProdEnv
        workspace:
          clean: all
        strategy:
          runOnce:
            preDeploy:
              steps:
                - task: Bash@3
                  displayName: Install ServiceNow
                  inputs:
                    targetType: inline
                    script: |
                      pip install snow --index-url=https://azure:$(System.AccessToken)@pkgs.dev.azure.com/$(ADO_ORG)/$(ADO_PROJ)/_packaging/python-azure-artifacts/pypi/simple/
                - task: Bash@3
                  name: snow
                  displayName: Create Standard RFC from Template
                  # This task, I'm registering the SYS_ID of the RFC being created. I want to use this throughout the rest
                  # of the Deployment Job.
                  inputs:
                    targetType: inline
                    script: |
                      export sys_id=$(servicenow standard create template $(std_tmpl_sys_id) --query="result.sys_id.value")
                      echo "##vso[task.setvariable variable=rfc_sys_id;isoutput=true]$sys_id"
                  env:
                    SNOW_USER: '$(SNOW_USER)'
                    SNOW_PASS: '$(SNOW_PASS)'
                - task: Bash@3
                  displayName: Progress RFC to Scheduled
                  # This works, for this one task.
                  inputs:
                    targetType: inline
                    script: |
                      servicenow standard update $(snow.rfc_sys_id) state=Scheduled
                  env:
                    SNOW_USER: '$(SNOW_USER)'
                    SNOW_PASS: '$(SNOW_PASS)'
            deploy:
              steps:
                - task: Bash@3
                  displayName: Install ServiceNow
                  inputs:
                    targetType: inline
                    script: |
                      pip install snow --index-url=https://azure:$(System.AccessToken)@pkgs.dev.azure.com/$(ADO_ORG)/$(ADO_PROJ)/_packaging/python-azure-artifacts/pypi/simple/
                - task: Bash@3
                  displayName: Progress RFC to Implement
                  # Here, I attempt to get the registered variable from the preDeploy "phase" and use it as a Shell Variable
                  # because otherwise Azure DevOps would try to just execute it as a shell command.
                  inputs:
                    targetType: inline
                    script: |
                      servicenow standard update ${RFC_SYS_ID} state=Implement
                  env:
                    SNOW_USER: '$(SNOW_USER)'
                    SNOW_PASS: '$(SNOW_PASS)'
                    RFC_SYS_ID: $[ dependencies.BuildPythonApp.outputs['preDeploy.rfc_sys_id'] ]
                - task: Bash@3
                  displayName: Perform Changes
                  inputs:
                    targetType: inline
                    script: |
                      echo "Hello, World!"
            on:
              success:
                steps:
                  - task: Bash@3
                    displayName: Install ServiceNow
                    inputs:
                      targetType: inline
                      script: |
                        pip install snow --index-url=https://azure:$(System.AccessToken)@pkgs.dev.azure.com/$(ADO_ORG)/$(ADO_PROJ)/_packaging/python-azure-artifacts/pypi/simple/
                  - task: Bash@3
                    displayName: Progress RFC to Review
                    # This was another method I tired to use to reference the registered variable.
                    # It did not work.
                    inputs:
                      targetType: inline
                      script: |
                        servicenow standard update $(snow.rfc_sys_id) state=Review
                    env:
                      SNOW_USER: '$(SNOW_USER)'
                      SNOW_PASS: '$(SNOW_PASS)'
                  - task: Bash@3
                    displayName: Progress RFC to Closed
                    inputs:
                      targetType: inline
                      script: |
                        servicenow standard update $(snow.rfc_sys_id) state=Closed
                    env:
                      SNOW_USER: '$(SNOW_USER)'
                      SNOW_PASS: '$(SNOW_PASS)'
              failure:
                steps:
                  - task: Bash@3
                    displayName: Install ServiceNow
                    inputs:
                      targetType: inline
                      script: |
                        pip install snow --index-url=https://azure:$(System.AccessToken)@pkgs.dev.azure.com/$(ADO_ORG)/$(ADO_PROJ)/_packaging/python-azure-artifacts/pypi/simple/
                  - task: Bash@3
                    displayName: Progress RFC to Canceled
                    inputs:
                      targetType: inline
                      script: |
                        servicenow standard update $(snow.rfc_sys_id) state=Canceled
                    env:
                      SNOW_USER: '$(SNOW_USER)'
                      SNOW_PASS: '$(SNOW_PASS)'
...