[Bug/Question/Feature-Request] Parameters passed to Pipeline are not being accepted

Pipeline parameter seems not beeing accepted! :-(

- uses: Azure/pipelines@v1
with:
azure-devops-project-url: 'https://dev.azure.com/organization/project-name'
azure-pipeline-name: 'pipeline-name' # name of the Azure pipeline to be triggered
azure-devops-token: '${{ secrets.AZURE_DEVOPS_TOKEN }}'
**azure-pipeline-variables: '{"variable1": "value1", "variable2": "value2"}' # optional stringified json**

I get this error:

Warning: Unexpected input(s) 'azure-pipeline-variables', valid inputs are ['azure-devops-project-url', 'azure-pipeline-name', 'azure-devops-token']
Run Azure/pipelines@v1
Creating connection with Azure DevOps service : "https://dev.azure.com/SI-idtxccoe"
Connection created
**Error: Failed request: (401)**