How to resolve pipeline not triggering when merging in a Pull Request

Question

Hi,

We are currently facing an issue in our organisation where the pipelines sometimes don't seem to trigger and we have the start them manually.

We have three different pipeline YAML files:

android-acc.yml
android-dev.yml
android-prod.yml

Each of these YAML files contains a trigger for a specific branch:

trigger:
  branches:
    include:
      - 'development'

Due to the pipeline not triggering sometimes, I tried to configure a Trigger in the Triggers tab for the pipeline:

However, we are still facing some issues where the pipeline is sometimes not being triggered. When we manually trigger the pipeline, the pipeline runs without any issues.

What could be the issue here? Thanks in advance for your help and time.