AzurePowerShell task cannot find filePath

I'm trying to run a PowerShell script in Azure Yaml Pipelines and I'm getting this error:

##[error]The term 'D:\a\1\s\myPowershellFile.ps1' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

Code:

jobs:
  - deployment: Deploy
    displayName: Deploy
    environment: $(myEnvironment)
    pool:
      vmImage: 'windows-latest'

    strategy:
      runOnce:
        deploy:
          steps:          
          - task: AzurePowerShell@5
            displayName: 'Run Powershell script'
            inputs:
              azureSubscription: $(azureConnectionName)
              scriptType: filePath
              scriptPath: './myPowershellFile.ps1'
              azurePowerShellVersion: latestVersion

The file is pushed out to the repo for the branch that is triggering the build. I've also tried referencing the path explicitly with $(Pipeline.Workspace) and $(Build.SourcesDirectory). Version 4 also does not work. According to the docs this should be working!

After some more research I discovered this article which says that files are not automatically downloaded for deployment jobs. I added this step, and that fixed the issue!

- checkout: self