Can't SSH to registered host VM in GCP

If you are unable to access a VM in the Google Cloud Platform (GCP) due to a misconfiguration, you can enable a serial console.

When you register a Google Cloud Platform (GCP) Virtual Machine (VM) with Smallstep, you're effectively removing the use of the access keys that are automatically generated and managed at the time the VM was created. If you can't access the VM host, you can enable a serial console in GCP to gain access long enough to troubleshoot your certificate-based connection.