Summary

Unlike Linux runners, It is not possible to access the value of the variables in the pipelines using "$" with Windows Runners. 

Cause

Windows Runners run directly on Powershell. Therefore it uses a different syntax for referencing variables. 

Solution

For example, to access the value of the repository variable "test_value" in the pipeline windows runner, you may use $env:test_value. The sample Bitbucket YAML configuration is given below: 

pipelines:
  default:
    - step:
        runs-on: 
           - self.hosted
           - windows
        script: 
          - echo "This step will run on a self-hosted windows runner.";
          - Write-Output $env:test_value