workflow not executing when agent-based monitoring is used

workflow not executing when agent-based monitoring is used

Hello,
I installed the opmanager agent-based monitor on servers, but then workflows are not running : "workflow cannot be executed as the device xxxxx employs Agent-based monitoring". Is there a way to run workflow anyway ? Why is it not even possible to ping the server ? I have an issue with some vm server rebooting nightly and not restarting, therefore I need a workflow to check if they are online and if not , then automatically power on" the server. I hope that agentless monitoring is not the only solution.  Thank you for your reply
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