I followed the documentation for setting pool via [Pipelines Schema Docs](https://learn.microsoft.com/en-us/azure/devops/pipelines/yaml-schema?view=azure-devops&tabs=schema#pool)
and set it as such `pool: Default`. This should direct pipelines to use the Default pool:

[![Default agent pool under All agent pools in dev-ops UI](https://i.stack.imgur.com/y54N5.png)](https://i.stack.imgur.com/y54N5.png)

However, I keep getting this error:

[![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.](https://i.stack.imgur.com/OiN9A.png)](https://i.stack.imgur.com/OiN9A.png)

> 
> 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>.
> 
> 
> 

As far as I can tell it should be authorized.

I also tried:

```
pool:
  name: Default

```

Full azure-pipelines.yml

```
# 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://learn.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)'

```