Machine API Returns an "unknown instance type" error for a supported AWS instance in a MachineSet

Issue

• The machine-controller is emitting an unknown instance type, is my instance supported?

• The machine-controller is emitting an unknown instance type error even though the AWS instance is supported:

  $ oc logs -l k8s-app=controller -n openshift-machine-api -c machine-controller
  [...]
  I0112 14:51:10.117191       1 controller.go:59] controllers/MachineSet "msg"="Reconciling" "machineset"="XXX" "namespace"="openshift-machine-api"
  E0112 14:51:10.117604       1 controller.go:115] Unable to set scale from zero annotations: unknown instance type: %sm6i.xlarge
  E0112 14:51:10.117622       1 controller.go:116] Autoscaling from zero will not work. To fix this, manually populate machine annotations for your instance type: %v[machine.openshift.io/vCPU machine.openshift.io/memoryMb machine.openshift.io/GPU]
  I0112 14:51:10.117792       1 recorder.go:104] controller-runtime/manager/events "msg"="Warning"  "message"="Failed to set autoscaling from zero annotations, instance type unknown" "object"={"kind":"MachineSet","namespace":"openshift-machine-api","name":"XXX","uid":"XXX","apiVersion":"machine.openshift.io/v1beta1","resourceVersion":"121131434"} "reason"="FailedUpdate"