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The parameter LinuxFxVersion has an invalid value

See original GitHub issue

Question, Bug, or Feature?
Type: Bug

Enter Task Name: AzureRmWebAppDeployment@4

Environment

Server - Azure Pipelines
Agent - Hosted

Issue Description

I used the YAML pipeline assistant to create this task:

- task: AzureRmWebAppDeployment@4
  inputs:
    ConnectionType: 'AzureRM'
    azureSubscription: 'XXXX'
    appType: 'webAppLinux'
    WebAppName: 'XXXX'
    packageForLinux: '$(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip'
    RuntimeStack: 'DOTNETCORE|3.0'
    enableCustomDeployment: true
    DeploymentType: 'zipDeploy'

But when it runs, I get the following error:

Error: Failed to patch App Service ‘XXXX’ configuration. Error: BadRequest - The parameter LinuxFxVersion has an invalid value. (CODE: 400)

The code is being deployed to a Web App (.NET Core 3.0 stack) on a Linux App Service Plan.

Task logs

logs_71.zip

Error logs

##[debug][PATCH]https://management.azure.com/subscriptions/XXXXXXXX-7c9b-4726-9bdb-8dea951e5b6b/resourceGroups/XXXX/providers/Microsoft.Web/sites/XXXX/config/web?api-version=2016-08-01 ##[debug]Deployment Failed with Error: Error: Failed to patch App Service ‘XXXX’ configuration. Error: BadRequest - The parameter LinuxFxVersion has an invalid value. (CODE: 400) ##[debug]task result: Failed ##[error]Error: Failed to patch App Service ‘’ configuration. Error: BadRequest - The parameter LinuxFxVersion has an invalid value. (CODE: 400) ##[debug]Processed: ##vso[task.issue type=error;]Error: Failed to patch App Service ‘XXXX’ configuration. Error: BadRequest - The parameter LinuxFxVersion has an invalid value. (CODE: 400) ##[debug]Processed: ##vso[task.complete result=Failed;]Error: Failed to patch App Service ‘XXXX’ configuration. Error: BadRequest - The parameter LinuxFxVersion has an invalid value. (CODE: 400)