Powershell de ieșire nu tip de matrice, dar de tip string?

Salut, am scris un script pentru a apela la AZ migrația api

        $siteuri= 'https://management.azure.com/subscriptions/' + $metadata.compute.subscriptionID +'/resourceGroups/' + $AzMigreateResourceGroup+ '/providers/Microsoft.Migrate/migrateProjects/' + $ProjectName + '/solutions/Servers-Discovery-ServerDiscovery?api-version=2018-09-01-preview'
        $siteoutput=(Invoke-RestMethod -Headers $Authtoken -uri $siteuri).properties.details.extendeddetails.applianceNameToSiteIdMapV3

rezultatul nu este

[
  {
    "lab3dev-app01": {
      "ApplianceName": "xxx",
      "SiteId": "xxx",
      "KeyVaultId": "xxx",
      "KeyVaultUrl": "xxx",
      "ApplianceDetails": {
        "machineID": "xxx",
        "IPAddress": "192.168.50.210",
        "HostName": "WIN-ETP6NTN8B65",
        "isRegistered": true,
        "discoveryStatus": "Success",
        "deepDiscoveryDisabled": false
      },
      "CertificateContents": {
        "xxx": ""
      },
      "AadAppDetails": {
        "TenantID": "xxx",
        "AppName": "xxx",
        "AppID": "xxx",
        "ObjectID": "xxx"
      },
      "ScaleOutList": null,
      "isV2Site": false
    }
  },
  {
    "l3devhyper01": {
      "ApplianceName": "xxx",
      "SiteId": "xxx",
      "KeyVaultId": "xxx",
      "KeyVaultUrl": "xxx",
      "ApplianceDetails": {
        "machineID": "xxx",
        "IPAddress": "192.168.50.143",
        "HostName": "WIN-PKKCDSLE6OD",
        "isRegistered": true,
        "discoveryStatus": "Success",
        "deepDiscoveryDisabled": false
      },
      "CertificateContents": {
        "l3devhyper017a74agentauthcertv2": ""
      },
      "AadAppDetails": {
        "TenantID": "xxx",
        "AppName": "xxx",
        "AppID": "xxx",
        "ObjectID": "xxx"
      },
      "ScaleOutList": null,
      "isV2Site": false
    }
  }
]

Speram ca acest lucru poate fi un tip de matrice, deci pot face unele de căutare, dar gettype() mi spune acest lucru este un șir de caractere?

oricum este acolo pentru a ieșire de acest fel de matrice nu un șir de caractere?