无法在powershell中将json数组转换为List

data.json：

{
     "displayName": "travel with mailbox permission",
     "tactics": [
            "InitialAccess",
            "PrivilegeEscalation"
          ],
          "techniques": [
            "T1078",
            "T1548"
          ]
  }    

代码：

$content = Get-Content -Raw -Path "data.json" | ConvertFrom-Json
$TacticObject = New-Object System.Collections.Generic.List[System.Object]
        foreach ($Tactic in $content.tactics) {
            $TacticObject.Add($Tactic)
        }  

echo$TacticObject

新建AzSentinelAlertRule-ResourceGroupName$ResourceGroupName-WorkspaceName$WorkspaceName-Tactic$TacticObject

输出：

InitialAccess
PrivilegeEscalation

错误：

[BadRequest] : Field 'tactics[0]' contains an invalid value 'InitialAccess PrivilegeEscalation'.