pr not triggered when opening github PR (Azure pipeline YAML)

Question

The goal

I'm pretty new to Azure and pipelines, and I'm trying to trigger a pipeline from a pr in Azure. The repo lives in Github.

Here is the pipeline yaml: pipeline.yml

trigger: none # I turned this off for to stop push triggers (but they work fine)

pr:
  branches:
    include:
      - "*" # This does not trigger the pipeline 

stages:
  - stage: EchoTriggerStage
    displayName: Echoing trigger reason
    jobs:
      - job: A
        steps:
          - script: echo 'Build reason::::' $(Build.Reason)
            displayName: The build reason

# ... some more stages here triggered by PullRequests....
# ... some more stages here triggered by push (CI)....

The pr on Github looks like this:

The problem

However, the pipeline is not triggered, when the push triggers work just fine.

I have read in the docs but I can't see why this does not work.

The pipeline is working perfectly fine when I am triggering it through git push. However, when I try to trigger it with PR's from Github, nothing happens. In the code above, I tried turning off push triggers, and allow for all pr's to trigger the pipeline. Still nothing.

I do not want to delete the pipeline yet and create a new one.

Update

I updated the yaml file to work as suggested underneath. Since the pipeline actually runs through a push command now, the rest of the details of the yaml file are not relevant and are left out.

Other things I have tried

• Opening new PR on Github
• Closing/Reopening PR on Github
• Making change to existing PR on Github

-> Still no triggering of pipeline.

Answer 1

You have a mistake in your pipeline. It should be like this:

trigger: none # turned off for push

pr:
  - feature/automated-testing

steps:
- script: echo "PIPELINE IS TRIGGERED FROM PR"

Please change this

  - stage:
      - script: echo "PIPELINE IS TRIGGERED FROM PR"

to

  - stage:
    jobs:
    - job:
      steps:
      - script: echo "PIPELINE IS TRIGGERED FROM PR"

EDIT

I used your pipeline

trigger: none # I turned this off for to stop push triggers (but they work fine)

pr:
  branches:
    include:
      - "*" # This does not trigger the pipeline 

stages:
  - stage: EchoTriggerStage
    displayName: Echoing trigger reason
    jobs:
      - job: A
        steps:
          - script: echo 'Build reason::::' $(Build.Reason)
            displayName: The build reason

# ... some more stages here triggered by PullRequests....
# ... some more stages here triggered by push (CI)....

and all seems to be working.

Here is PR and here build for it

I didn't do that but you can try to enforce this via branch policy. TO do that please go to repo settings and then as follow:

Answer 2

The solution was to go to Azure Pipelines -> Edit pipeline -> Triggers -> Enable PR validation.