Remote Collector does not show in the Sensors page

Make sure that firewall(s) between the Guardian and the Remote Collector allows traffic on the TCP/443 port (hypertext transfer protocol secure (HTTPS)), with the Remote Collector as Source and the Guardian as the Target.
Check that the tokens are correctly configured, both in the Guardian and in the Remote Collector.
Check the /data/log/n2os/n2osjobs.log file of the Remote Collector for connection errors.