我正在尝试使用Bicep将Recovery Services Vault部署为基础架构版本的一部分。我在部署一个备份策略时遇到了问题，尤其是虚拟机快照备份策略（AzureIaaSVM）。
我已经按照Bicep参考页面创建了模板，但在尝试部署时验证失败。我正在使用VSCode进行开发，当我从Bicep文件构建ARM模板时，验证失败，并显示以下消息：

如果我对文档的理解正确的话，这里应该不仅仅允许“AzureStorage”。
我的问题是，这是一个工具/API的问题还是我误解了文档？如果是，我需要修改什么才能让它工作？
模板：

resource vmSnapshotBackupPolicy 'Microsoft.RecoveryServices/vaults/backupPolicies@2022-03-01' = {
  name: 'vm-snapshot-policy'
  location: resourceLocation
  parent: recoveryServicesVault
  properties: {
    protectedItemsCount: 0
    backupManagementType: 'AzureIaasVM'
    instantRPDetails: {
      azureBackupRGNamePrefix: 'vmsnapshot'
    }
    instantRpRetentionRangeInDays: 2
    policyType: 'V1'
    retentionPolicy: {
      retentionPolicyType: 'LongTermRetentionPolicy'
      dailySchedule: {
        retentionDuration: {
          count: 7
          durationType: 'Days'
        }
        retentionTimes: [
          '2022-10-21T02:00:00Z'
        ]
      }
      monthlySchedule: {
        retentionDuration: {
          count: 6
          durationType: 'Months'
        }
        retentionScheduleDaily: {
          daysOfTheMonth: [
            {
              date: 1
              isLast: false
            }
          ]
        }
        retentionScheduleFormatType: 'Daily'
        retentionTimes: [
          '2022-10-21T02:00:00Z'
        ]
      }
      weeklySchedule: {
        daysOfTheWeek: [
          'Sunday'
        ]
        retentionDuration: {
          count: 4
          durationType: 'Weeks'
        }
        retentionTimes: [
          '2022-10-21T02:00:00Z'
        ]
      }
      yearlySchedule: {
        monthsOfYear: [
          'July'
        ]
        retentionDuration: {
          count: 2
          durationType: 'Years'
        }
        retentionScheduleDaily: {
          daysOfTheMonth: [
            {
              date: 1
              isLast: false
            }
          ]
        }
        retentionScheduleFormatType: 'Daily'
        retentionTimes: [
          '2022-10-21T02:00:00Z'
        ]
      }
    }
    schedulePolicy: {
      schedulePolicyType: 'SimpleSchedulePolicy'
      scheduleRunFrequency: 'Daily'
      scheduleRunTimes: [
        '2022-10-21T02:00:00Z'
      ]
      scheduleWeeklyFrequency: 0
    }
    timeZone: 'UTC'
  }

}