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I don't know if it's my build pipeline that is something wrong with, I can see there is generated any artifact, so maybe thats why it can't find it

My code is structered like this and the Pulumi project is inside ./infrastructure

Can you add the entire azure-pipeline.yml file (removing any secrets you have in there)

steps:
- task: pulumi.build-and-release-task.custom-build-release-task.Pulumi@1
  displayName: 'Run pulumi'
  inputs:
    azureSubscription: 'Sandbox Portal Unitsystem'
    command: up
    args: '--yes --skip-preview'
    cwd: ./
    stack: 'carvedrock-training-python'

the `cwd` option needs to point at the folder that contains (in your case) the `__main__.py`  file

Sure, but how do I reference that in the correct syntax?

I have made it all from scrats again and kept everything in the root of my folder but now I get this:

And what should my artifact be, just the repo right?

Have you see this page? <https://www.pulumi.com/docs/guides/continuous-delivery/azure-devops/>