How to determine why an agent pool is offline in Azure dev-ops

Login to powershell.Navigate to the agent folder where it contains run cmd prompt and config cmd prompt.

Execute the following command

.\run.cmd

Try logging into the VM, and run the run.cmd from an elevated powershell prompt in your agent directory. Source: https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/v2-windows?view=azure-devops