以下是我需要传递给API的键值对。不知道我在哪里错

$Body = @{
    
    hostName            = 'null'
    hostOperatingSystem = 0
    optionalFilter1     = 'null'
    optionalFilter2     = 'null'
    description         = 'null'
    serviceName         = "ServiceManager.Logging"
    sectionName         = "Services"
    signature           = 'null'
    value               = @( @{
            Services = @( @{
                              
                    FullPath      = "..\Service\microService.exe"
                    InstanceCount = 2
                })
                            
                          
        })
} | ConvertTo-Json -Depth 4


  $Response = Invoke-RestMethod -Uri $URI -Method PUT -Headers $Headers -Body $Body -ContentType 'application/json'

以下是我遇到的错误

Invoke-RestMethod : {"":["JsonToken EndArray is not valid for closing JsonType Object. Path '',line 14,position 15."],"value":["Unexpected character encountered while parsing value: [. Path 'value',line 5,position 15."]}