diff --git a/src/cmd/purge/scripts/exchangePurge.ps1 b/src/cmd/purge/scripts/exchangePurge.ps1
index 7ba036522..240364b8d 100644
--- a/src/cmd/purge/scripts/exchangePurge.ps1
+++ b/src/cmd/purge/scripts/exchangePurge.ps1
@@ -618,6 +618,10 @@ function Purge-Items {
 Write-Host 'Authenticating with Exchange Web Services ...'
 $global:Token = Get-AccessToken | ConvertTo-SecureString -AsPlainText -Force 
 
+# ensure that there are no unexpanded entries in the list of parameters
+$FolderNamePurgeList = $FolderNamePurgeList | ForEach-Object { @($_.Split(',').Trim()) }
+$FolderPrefixPurgeList = $FolderPrefixPurgeList | ForEach-Object { @($_.Split(',').Trim()) }
+
 $purgeFolderParams = @{
     'WellKnownRoot'         = "root";
     'FolderNamePurgeList'   = $FolderNamePurgeList;
diff --git a/src/cmd/purge/scripts/onedrivePurge.ps1 b/src/cmd/purge/scripts/onedrivePurge.ps1
index 641445c1f..dbb31c1e8 100644
--- a/src/cmd/purge/scripts/onedrivePurge.ps1
+++ b/src/cmd/purge/scripts/onedrivePurge.ps1
@@ -112,6 +112,10 @@ function Purge-Library {
 
 ######## MAIN #########
 
+# ensure that there are no unexpanded entries in the list of parameters
+$LibraryNameList = $LibraryNameList | ForEach-Object { @($_.Split(',').Trim()) }
+$FolderPrefixPurgeList = $FolderPrefixPurgeList | ForEach-Object { @($_.Split(',').Trim()) }
+
 # Setup SharePointPnP
 if (-not (Get-Module -ListAvailable -Name PnP.PowerShell)) {
     $ProgressPreference = 'SilentlyContinue'