AzureAppServiceSettings@1 - Conflict - Parameter with name Version already exists

Question

I have an Azure DevOps Pipeline below:

...

steps:
- task: AzureAppServiceSettings@1
  displayName: 'Update App Service app settings'
  inputs:
    azureSubscription: ${{parameters.azureSubscription}}
    appName: ${{parameters.appName}}
    resourceGroupName: ${{parameters.resourceGroupName}}
    slotName: ${{parameters.slotName}}
    appSettings: |
      [
        {
          "name": "${{parameters.settingName}}",
          "value": "${{parameters.buildNumber}}",
          "slotSetting": false
        }
      ]

...

When running my pipeline, I'm getting the error:

##[error]Error: Failed to update App service 'my-application-blue' application settings. Error: Conflict - Parameter with name Version already exists. (CODE: 409)

The parameter Version indeed already exists on my app configuration, but what's odd is that I have the same parameter on other apps, and the same step runs fine on those apps.

All I could find when researching, was that another deployment could be ongoing, but that's not the case, I restarted the app and retried the step and the same error persists.

How can it fix it or find the issue?

Answer 1

The issue was happening because a config key with value VERSION already existed.

My guess is when the task is deciding whether to create or update a value, it doesn't find an existing key, but trying to add the same key under a different casing causes the issue.

Updating the existing key from VERSION to Version fixed the issue and the step executed normally.