fix: resolve SharePoint User Information List by template instead of localized display name

Author: Luis Mengel

Modules/CIPPCore/Public/Entrypoints/HTTP Functions/Teams-Sharepoint/Invoke-ListSiteMembers.ps1

@@ -0,0 +1,36 @@
+Function Invoke-ListSiteMembers {
+    <#
+    .FUNCTIONALITY
+        Entrypoint
+    .ROLE
+        Sharepoint.Site.Read
+    #>
+    [CmdletBinding()]
+    param($Request, $TriggerMetadata)
+
+    $TenantFilter = $Request.Query.TenantFilter
+    $SiteId = $Request.Query.SiteId
+
+    try {
+        # Find User Information List by template (language independent)
+        $Lists = New-GraphGetRequest -uri "https://graph.microsoft.com/beta/sites/$SiteId/lists?`$select=id,list,system" -tenantid $TenantFilter -AsApp $true
+        $UIList = $Lists | Where-Object { $_.list.template -eq 'userInformation' } | Select-Object -First 1
+
+        if ($UIList.id) {
+            $Items = New-GraphGetRequest -uri "https://graph.microsoft.com/beta/sites/$SiteId/lists/$($UIList.id)/items?`$expand=fields" -tenantid $TenantFilter -AsApp $true
+        } else {
+            $Items = @()
+        }
+
+        $StatusCode = [HttpStatusCode]::OK
+        $Body = @($Items)
+    } catch {
+        $StatusCode = [HttpStatusCode]::Forbidden
+        $Body = Get-NormalizedError -Message $_.Exception.Message
+    }
+
+    return ([HttpResponseContext]@{
+        StatusCode = $StatusCode
+        Body       = @{ 'Results' = $Body }
+    })
+}