How to pass a variable value between Azure Pipeline jobs (within the same stage)?

Since the jobs operate in different namespaces, passing variable values between them is unlike passing a variable value from one function to another.

In the example below, $app_Token is the variable name that needs to be sent from one job to another job but within the same stage.

This issue can be resolved by dynamically storing the variable in the variable library and retrieving its value from there. The task.setvariable command, which is illustrated below, is required to store variables using PowerShell in the Azure Pipeline library.

Full example:

# Maven

# Build your Java project and run tests with Apache Maven.
# Add steps that analyze code, save build artifacts, deploy, and more:
# https://docs.microsoft.com/azure/devops/pipelines/languages/java

trigger:
- master

stages:
  - stage: VariableUpdateAutomation
    jobs:
    - job: Set_AppTokenValue
      pool:
        vmImage: ubuntu-latest
      steps:
      - task: PowerShell@2
        name: Set_AppTokenValue
        inputs:
          targetType: 'inline'
          script: |          
            $app_Token =  '$(APPTOKEN)' #Reading APPTOKEN variable value
            Write-Output "The app token value till now is: $app_Token"
            $app_Token = "ABCDE12345"
            echo "##vso[task.setvariable variable=AppToken;isOutput=true]$app_Token" 
            #Updating app_Token value from ABCDE12345 with the value that we have in variables
    
    - job: Get_AppTokenValue
      dependsOn: Set_AppTokenValue
      variables:
      - name: BSAppToken
        value: $[ dependencies.Set_AppTokenValue.outputs['Set_AppTokenValue.AppToken'] ]
      pool:
        vmImage: ubuntu-latest
      steps:
      - task: PowerShell@2
        inputs:
          targetType: 'inline'
          script: |
            echo "Value of AppToken in this Job is = $(BSAppToken)"

Note: This task variable only pertains to that stage. The task variable value cannot be used directly in the new stage.