Azure DevOps YAML build pipeline stuck on self-hosted agent

Question

I have an issue with running a YAML based build pipeline on self-hosted agents. After the build is triggered, it gets stuck on Preparing an agent for the job - Waiting for the request to be queued.

The azure-pipelines.yml looks like this:

trigger:
- master

pool:
  name: Default

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

If I change to a Microsoft hosted agent, the build does work:

trigger:
- master

pool:
  vmImage: ubuntu-16.04

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

The strange thing is that I have other existing YAML build pipelines that is working fine on the self-hosted agents, but all new pipelines I try to create just ends up getting stuck with Waiting for the request to be queued.

I have tried on what is currently the latest versions of the agent daemon, both 2.164.8 and 2.165.0, to no avail. I have also checked that I am not being limited by the maximum number of parallel jobs in DevOps.

Answer 1

It turned out to be a permission issue to the agent pool. In Organization Settings => Agent Pools => POOL_NAME => Security, there is a setting called Grant access permission to all pipelines. After enabling this, my builds are now working as expected.