title: Error when trying to set pipeline pool to Default agent pool using azure-pipelines.yml
body: <p>I followed the documentation for setting pool via <a href="https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema?view=azure-devops&amp;tabs=schema#pool" rel="noreferrer">Pipelines Schema Docs</a>
  and set it as such <code>pool: Default</code>. This should direct pipelines to use the Default pool:</p>
  
  <p><a href="https://i.stack.imgur.com/y54N5.png" rel="noreferrer"><img src="https://i.stack.imgur.com/y54N5.png" alt="Default agent pool under All agent pools in dev-ops UI"></a></p>
  
  <p>However, I keep getting this error:</p>
  
  <p><a href="https://i.stack.imgur.com/OiN9A.png" rel="noreferrer"><img src="https://i.stack.imgur.com/OiN9A.png" alt="Could not find a pool with name Default. The pool does not exist or has not been authorized for use. For authorization details, refer to https://aka.ms/yamlauthz."></a></p>
  
  <blockquote>
    <p>Could not find a pool with name Default. The pool does not exist or has not been authorized for use. For authorization details, refer to <a href="https://aka.ms/yamlauthz" rel="noreferrer">https://aka.ms/yamlauthz</a>.</p>
  </blockquote>
  
  <p>As far as I can tell it should be authorized.</p>
  
  <p>I also tried:</p>
  
  <pre><code>pool:
    name: Default
  </code></pre>
  
  <p>Full azure-pipelines.yml</p>
  
  <pre><code># ASP.NET Core (.NET Framework)
  # Build and test ASP.NET Core projects targeting the full .NET Framework.
  # Add steps that publish symbols, save build artifacts, and more:
  # https://docs.microsoft.com/azure/devops/pipelines/languages/dotnet-core
  
  name: $(BuildDefinitionName)_$(SourceBranchName)_$(Date:yyyyMMdd)$(Rev:.r)
  
  trigger:
    batch: true
    branches:
      include:
      - master
      - develop
  
  pool: Default
  
  variables:
    solution: '**/*.sln'
    buildPlatform: 'Any CPU'
    buildConfiguration: 'Release'
  
  steps:
  - task: NuGetToolInstaller@0
  
  - task: NuGetCommand@2
    inputs:
      restoreSolution: '$(solution)'
  
  - task: VSBuild@1
    inputs:
      solution: '$(solution)'
      msbuildArgs: '/p:DeployOnBuild=true /p:WebPublishMethod=Package /p:PackageAsSingleFile=true /p:SkipInvalidConfigurations=true /p:DesktopBuildPackageLocation="$(build.artifactStagingDirectory)\WebApp.zip" /p:DeployIisAppPath="Default Web Site"'
      platform: '$(buildPlatform)'
      configuration: '$(buildConfiguration)'
  
  - task: VSTest@2
    inputs:
      platform: '$(buildPlatform)'
      configuration: '$(buildConfiguration)'
  </code></pre>