When your pipeline does not run, please check for the following:
1. If there is a matching agent for the pipeline. Also, if your agents are all assigned to an environment, please cross check if your pipeline belongs to any of these environments.
2. If there is pipeline dependency, please check if the upstream pipelines have run successfully.
3. In case your pipeline is dependent on a SCM material, the material update in Go should work fine.
If none of the above is the case, try a force trigger and check for the pop up error towards the bottom right of the Go dashboard.