gcloud compute instances list
NAME                  ZONE           MACHINE_TYPE               PREEMPTIBLE  INTERNAL_IP  EXTERNAL_IP     STATUS
instance-1            us-central1-f  custom (1 vCPU, 8.00 GiB)               10.240.0.2                   TERMINATED
piperband-group-95p1  us-central1-f  custom (1 vCPU, 8.00 GiB)               10.240.0.4   35.224.97.151   RUNNING
piperband-group-cbsn  us-central1-f  custom (1 vCPU, 8.00 GiB)               10.240.0.3   35.188.194.119  RUNNING

WORKS^

BUT:
----
gcloud compute instance-groups list-instances piperband-group
ERROR: (gcloud.compute.instance-groups.list-instances) Some requests did not succeed:
 - The resource 'projects/stately-will-107018/zones/us-west1-a/instanceGroups/piperband-group' was not found

DOESN'T WORK.

ERROR DUMP:
----
gcloud compute instance-groups list-instances piperband-group --verbosity=debug                                                  1 ↵  ⚙  10057  12:20:48
DEBUG: Running [gcloud.compute.instance-groups.list-instances] with arguments: [--verbosity: "debug", NAME: "piperband-group"]
DEBUG: (gcloud.compute.instance-groups.list-instances) Some requests did not succeed:
 - The resource 'projects/stately-will-107018/zones/us-west1-a/instanceGroups/piperband-group' was not found
Traceback (most recent call last):
  File "/Users/dev/home/lib/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 791, in Execute
    resources = calliope_command.Run(cli=self, args=args)
  File "/Users/dev/home/lib/google-cloud-sdk/lib/googlecloudsdk/calliope/backend.py", line 756, in Run
    resources = command_instance.Run(args)
  File "/Users/dev/home/lib/google-cloud-sdk/lib/surface/compute/instance_groups/list_instances.py", line 80, in Run
    utils.RaiseToolException(errors)
  File "/Users/dev/home/lib/google-cloud-sdk/lib/googlecloudsdk/api_lib/compute/utils.py", line 106, in RaiseToolException
    RaiseException(problems, calliope_exceptions.ToolException, error_message)
  File "/Users/dev/home/lib/google-cloud-sdk/lib/googlecloudsdk/api_lib/compute/utils.py", line 118, in RaiseException
    errors))
ToolException: Some requests did not succeed:
 - The resource 'projects/stately-will-107018/zones/us-west1-a/instanceGroups/piperband-group' was not found

ERROR: (gcloud.compute.instance-groups.list-instances) Some requests did not succeed:
 - The resource 'projects/stately-will-107018/zones/us-west1-a/instanceGroups/piperband-group' was not found