azure-pipelines-tasks: [AzureRmWebAppDeployment@4] Unable to access output variable AppServiceApplicationUrl

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Required Information

Question, Bug, or Feature?
Type: Appears to be a bug.

Enter Task Name: AzureRmWebAppDeployment@4

Environment

• Server - Azure Pipelines or TFS on-premises? Azure Pipelines

• If using Azure Pipelines, provide the account name, team project name, build definition name/build number:

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• Agent - Hosted or Private: It’s fully hosted in Azure DevOps as part of a paid subscription.

Issue Description

We have been using the AppServiceApplicationUrl output variable property of the AzureRmWebAppDeployment@4 task in a different Bash task. This has worked for a few years up to 2022-Jun-15. But stopped working the next day. The logs suggest the AzureRmWebAppDeployment@4 task is not setting any output any more. This means the variable reference for AppServiceApplicationUrl no longer works in the subsequent task.

Sample YAML snippet:

          <...snip...>
          - task: AzureRmWebAppDeployment@4
            displayName: 'Azure App Service Deploy: Setup update run'
            name: update_foo
            inputs:
              azureSubscription: $(webapp_service_connection)
              ResourceGroupName: $(webapp_resource_group)
              appType: webAppContainer
              WebAppName: $(webapp)
              SlotName: $(webapp_slot)
              deployToSlotOrASE: true
              DockerNamespace: $(docker_registry_server)
              DockerRepository: $(docker_container_repo)
              DockerImageTag: $(docker_image_tag)
              StartupCommand: '/bin/bash /path/to/our/custom/update/script.sh'
              AppSettings: -OUR_ENV_TYPE $(webapp_env_type)
          <...snip...>
          - task: Bash@3
            displayName: 'Curl: Wake up the Webapp'
            name: wakeup
            inputs:
              targetType: inline
              script: sleep 10; curl $(update_foo.AppServiceApplicationUrl)/path/to/a/page
              timeoutInMinutes: 5

It’s the $(update_foo.AppServiceApplicationUrl) part in the Bash task that no longer resolves.

Task logs

The following log snippet is from a successful run when all was fine. I have redacted URLs etc.

<...snip...>
022-06-15T15:32:33.7048080Z ##[debug]Correlation ID from ARM api call response : 57c82e72-696d-4e61-a086-2965142edfef
2022-06-15T15:32:33.7114831Z App Service Application URL: https://our-site-name.azurewebsites.net
2022-06-15T15:32:33.7117820Z ##[debug]set AppServiceApplicationUrl=https://our-site-name.azurewebsites.net
2022-06-15T15:32:33.7127030Z ##[debug]Processed: ##vso[task.setvariable variable=AppServiceApplicationUrl;isOutput=false;issecret=false;]https://our-site-name.azurewebsites.net
2022-06-15T15:32:33.7128418Z ##[debug]Deployment Succeded
2022-06-15T15:32:33.7173865Z ##[section]Finishing: Azure App Service Deploy: Setup update run
<...snip...>

The same portion now looks like this:

<...snip...>
2022-06-17T09:33:41.7896425Z ##[debug]Correlation ID from ARM api call response : 5491d324-409e-4d43-9c17-0f84e9a07d5f
2022-06-17T09:33:41.7897248Z ##[debug]No changes in metadata properties, skipping update.
2022-06-17T09:33:41.7897988Z ##[debug]Deployment Succeded
2022-06-17T09:33:41.7908907Z ##[section]Finishing: Azure App Service Deploy: Setup update run
<...snip...>