Loop CSV and post data through REST API - api

Question

I have simple CSV file like:
device,template
dlinkrouter,DLink DGS Switch
cisco, DLink DGS Switch
And simple script like below:
$csv = Import-Csv "C:\Users\m.zurek\Desktop\devices.csv"
$csv.device | ForEach-Object {
Write-Host $_
$action = "http://localhost:8090/api/json/ncmsettings/addDevice"
$hash = #{}
$hash.Add("apiKey", "cb464d185c0cdf785295a6a0a1d227a2")
$hash.Add("IPADDRESS", $($_))
$hash.Add("DEVICE_BEHAVIOUR", "DLink DGS Switch")
$adddev = Invoke-WebRequest -Uri $action -UseBasicParsing -Body $hash -Method Post
return $adddev
}
Problem is that the script adds only the first device from the CSV file. On the rest I have response from API about error. Not sure if it's a problem with API or with my script.
StatusCode : 200
StatusDescription :
Content : {"Message":"Error in adding device. Zip the logs folder and send it to support.","isSuccess":false,"statusMsg":"Failure","bulkResourceIds":[]}
RawContent : HTTP/1.1 200
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,POST
Access-Control-Max-Age: 5000
Transfer-Encoding: chunked
Vary: Accept-Encoding
Content-Type: application/json;c...
Forms :
Headers : {[Access-Control-Allow-Origin, *], [Access-Control-Allow-Methods, GET,POST], [Access-Control-Max-Age, 5000], [Transfer-Encoding, chunked]...}
Images : {}
InputFields : {}
Links : {}
ParsedHtml :
RawContentLength : 144
Write-Host works fine and write name of all devices from CSV.