group duplicate fix.

Author: KelvinTegelaar

Modules/CIPPCore/Public/New-CIPPGroup.ps1

@@ -41,6 +41,23 @@ function New-CIPPGroup {
     )
 
     try {
+        $GroupCacheTable = Get-CIPPTable -tablename 'CacheGroupCreation'
+        $SafeDisplayName = $GroupObject.displayName -replace '[^a-zA-Z0-9-]', '_'
+        $CacheRowKey = '{0}_{1}' -f $TenantFilter, $SafeDisplayName
+        $TenMinutesAgo = (Get-Date).AddMinutes(-10).ToUniversalTime().ToString('yyyy-MM-ddTHH:mm:ssZ')
+        $CachedGroup = Get-CIPPAzDataTableEntity @GroupCacheTable -Filter "PartitionKey eq 'GroupCreation' and RowKey eq '$CacheRowKey' and Timestamp ge datetime'$TenMinutesAgo'"
+        if ($CachedGroup -and $CachedGroup.GroupId) {
+            Write-LogMessage -API $APIName -tenant $TenantFilter -message "Group '$($GroupObject.displayName)' was recently created (cached id: $($CachedGroup.GroupId)), skipping duplicate creation" -Sev Info
+            return [PSCustomObject]@{
+                Success      = $true
+                Message      = "Group $($GroupObject.displayName) already exists (from cache)"
+                GroupId      = $CachedGroup.GroupId
+                GroupType    = $CachedGroup.GroupType
+                Email        = $CachedGroup.Email
+                AlreadyExist = $true
+            }
+        }
+
         # Normalize group type for consistent handling (accept camelCase from templates)
         $NormalizedGroupType = switch -Wildcard ($GroupObject.groupType.ToLower()) {
             'mail-enabled security' { 'Security'; break }
@@ -161,6 +178,16 @@ function New-CIPPGroup {
                 GroupType = $NormalizedGroupType
                 Email     = if ($NeedsEmail) { $Email } else { $null }
             }
+            $CacheEntity = @{
+                PartitionKey = 'GroupCreation'
+                RowKey       = $CacheRowKey
+                GroupId      = [string]$GraphRequest.id
+                DisplayName  = [string]$GroupObject.displayName
+                GroupType    = [string]$NormalizedGroupType
+                Email        = [string](if ($NeedsEmail) { $Email } else { '' })
+                Tenant       = [string]$TenantFilter
+            }
+            Add-CIPPAzDataTableEntity @GroupCacheTable -Entity $CacheEntity -Force
             if ($GroupObject.subscribeMembers) {
                 #Waiting for group to become available in Exo.
                 Start-Sleep -Seconds 10
@@ -240,6 +267,16 @@ function New-CIPPGroup {
                 GroupType = $NormalizedGroupType
                 Email     = $Email
             }
+            $CacheEntity = @{
+                PartitionKey = 'GroupCreation'
+                RowKey       = $CacheRowKey
+                GroupId      = [string]$GraphRequest.Identity
+                DisplayName  = [string]$GroupObject.displayName
+                GroupType    = [string]$NormalizedGroupType
+                Email        = [string]$Email
+                Tenant       = [string]$TenantFilter
+            }
+            Add-CIPPAzDataTableEntity @GroupCacheTable -Entity $CacheEntity -Force
         }
 
         Write-LogMessage -API $APIName -tenant $TenantFilter -message "Created group $($GroupObject.displayName) with id $($Result.GroupId)" -Sev Info