Free monitoring colliding with ops manager

I was trying out ops manager, but then I tried reversing it. I removed it, but free monitoring isn’t working anymore. When I run the db.enableFreeMonitoring command, I get this output

    {
            "state" : "enabled",
            "message" : "Host already monitored by MongoDB Ops Manager, Cloud Manager, or Atlas; Free Monitoring reporting interval set to once per month.",
            "url" : "",
            "userReminder" : "",
            "ok" : 1
    }

I tried turning off free monitoring and enabling it again, but that didn’t work either. Any ideas how to disable the other monitors?

Thanks