docs: def put_vmss_vm(access_token, subscription_id, resource_group, vmss_name, vm_id, vm_body):
      '''Update a VMSS VM. E.g. add/remove a data disk from a specifc VM in a scale set (preview).
         Note: Only currently enabled for Azure Canary regions.
  
      Args:
          access_token (str): A valid Azure authentication token.
          subscription_id (str): Azure subscription id.
          resource_group (str): Azure resource group name.
          vmss_name (str): Name of the new scale set.
          vm_id (int): VM ID of VM to update
          vmss_body (dictionary): Body containining 
  
      Returns:
          HTTP response. JSON body of the virtual machine scale set VM properties.
      '''
      endpoint = ''.join([get_rm_endpoint(),
                          '/subscriptions/', subscription_id,
                          '/resourceGroups/', resource_group,
                          '/providers/Microsoft.Compute/virtualMachineScaleSets/', vmss_name,
                          '/virtualMachines/', str(vm_id),
                          '?api-version=', COMP_API])
      body = json.dumps(vm_body)
      return do_put(endpoint, body, access_token)