Why Windows VM is failing to start with error "backend VM storage requires a backend storage class defined in the custom resource" in OpenShift Virtualization?

Issue

• A Windows Server 2022 VM was created from the template, but it's failing to start with following error in the VM status:

  - lastProbeTime: null
    lastTransitionTime: "2025-01-03T08:01:49Z"
    message: backend VM storage requires a backend storage class defined in the custom
      resource
    reason: FailedBackendStorageCreate
    status: "False"
    type: Synchronized

• The VM was created from the default Win 2022 template and have vTPM enabled by default.