title: Azure DevOps agent not picking up yml based jobs
body: <p>So I'm using Azure DevOps Server 2020 Update 1 and self-hosted agents on Linux. I'm desperately trying to get my agent to pick up my jobs but it won't. It's not busy, no capability issues (test pipeline with only a single &quot;hello world&quot;-style inline script), no permission issues (not that I can see). The diagnostic log looks fine, no connection issues as far as I can tell.
  Always this message comes out:</p>
  <p><strong>The agent request is not running because all potential agents are running other requests. Current position in queue: 1</strong></p>
  <p><strong>No agents in pool Default are currently able to service this request.</strong></p>
  <p>The funny thing is I've just discovered that my agent is picking up non-yaml jobs created in the classic editor. Why is that??? Anybody ever encountered this issue before??? Is there somewhere hidden in the guts of the Server a checkbox that must be ticked in order to run yaml pipelines?</p>