SharePoint alerts not working when added through PowerShell,

$url = "https://example.com/delete1"
$listName1 = "Discussion1"
$spWeb = Get-SPWeb $url -ErrorVariable err -ErrorAction SilentlyContinue
if ($err)
    Write-Host "createing web..."
    $spWeb = New-SPWeb -url $url -Template "STS#1" -Name "AlertsTest1" -Description "AlertsTest1"

$list = $spWeb.Lists.TryGetList($listName1)
if($list -eq $null)
    Write-Host "createing list..."
    $listTemplate = [Microsoft.SharePoint.SPListTemplateType]::DiscussionBoard
    $list = $spWeb.Lists.Add($listName1, $listName1, [int]$listTemplate)

$SPuser = $spWeb.EnsureUser('domain\user_SCAdmin')
$SPnewAlert = $SPuser.Alerts.Add()
$SPnewAlert.Title = "Powershell Alerts"
$SPnewAlert.List = $list
$SPnewAlert.DeliveryChannels = [Microsoft.SharePoint.SPAlertDeliveryChannels]::Email
$SPnewAlert.EventType = [Microsoft.SharePoint.SPEventType]::All
$SPnewAlert.AlertFrequency = [Microsoft.SharePoint.SPAlertFrequency]::Immediate


It works when I go to site and add a alert myself using User interface...

Also no alerts are displayed at weburl + /_layouts/15/MySubs.aspx...

  • it works when I add "i:0#.w|" to login name for some weird reasons "$spWeb.EnsureUser('i:0#.w|domain\user_SCAdmin')" – Mathematics Mar 26 '18 at 14:03

The key to understand here is that you should NOT be passing in the user name in the format domain\username when you are using a claims-based web application. If you are only using Windows claims on the zone then the call will likely succeed when you pass in domain\username.

 $claim = New-SPClaimsPrincipal -Identity corp\servero -IdentityType WindowsSamAccountName

The ToEncodedString() method returns a value like this: i:0#.w|domain\username

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