'Unable to create ACR container resource trigger

Having trouble setting up a pipeline that is triggered by pushing an image to an ACR repository. No matter how i try to define a trigger i always get the error:

Configuring the trigger failed, edit and save the pipeline again

As far as i can tell there's no more details as to what the problem is. Saving without a trigger entry seams fine.

Here's my pipeline:

trigger:
- none

resources:
  containers:
  - container: 'MyContainer'
    type: ACR
    azureSubscription: 'My-ServicePrincipal'
    resourceGroup: 'My-App-Development'
    registry: 'myappregistry.azurecr.io'
    repository: 'myrepository'
    image: 'myrepository' 
    trigger: 
      enabled: true
      tags:
        include: 
        - latest

pool:
  vmImage: ubuntu-latest

steps:
- script: echo Hello, world!
  displayName: 'Run a one-line script'


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