SharePoint Online: Terminate Workflow using PowerShell

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
Add-Type -Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.WorkflowServices.dll"

#Set Parameters
$SiteURL="https://crescenttech.sharepoint.com"
$ListName ="Project Tasks"
$WorkflowName ="Send Email"

#Get Credentials to connect
$Cred= Get-Credential

Try{
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
    
    #Get the Web, List and List Item Objects
    $Web = $Ctx.Web
    $Ctx.Load($Web)
    $List = $Web.Lists.GetByTitle($ListName)
    $ListItems = $List.GetItems([Microsoft.SharePoint.Client.CamlQuery]::CreateAllItemsQuery())
    $Ctx.Load($List)
    $Ctx.Load($ListItems)
    $Ctx.ExecuteQuery()

    #Initialize Workflow Manager and other related objects
    $WorkflowServicesManager = New-Object Microsoft.SharePoint.Client.WorkflowServices.WorkflowServicesManager($Ctx, $Web)
    $WorkflowSubscriptionService = $workflowServicesManager.GetWorkflowSubscriptionService()
    $WorkflowInstanceService = $WorkflowServicesManager.GetWorkflowInstanceService() 
    $WorkflowAssociations = $WorkflowSubscriptionService.EnumerateSubscriptionsByList($List.Id)
    $Ctx.Load($WorkflowAssociations)
    $Ctx.ExecuteQuery()

    #Get the Target workflow to Terminate
    $WorkflowAssociation = $WorkflowAssociations | Where {$_.Name -eq $WorkflowName}
  
    #Loop through each List Item
    ForEach($ListItem in $ListItems)
    {
        #Get Workflow Instances of the List Item            
        $WorkflowInstanceCollection = $WorkflowInstanceService.EnumerateInstancesForListItem($List.Id, $ListItem.Id) 
        $Ctx.Load($WorkflowInstanceCollection)
        $Ctx.ExecuteQuery()
        
        #Filter All Workflows Instances of the target workflow where Status is: Started or Canceled or Suspended
        $WorkflowInstancesToKill = $WorkflowInstanceCollection | Where { ($_.Status -eq "Started" -or $_.Status -eq "Canceled" -or $_.Status -eq "Suspended") `
                                                                 -and $_.WorkflowSubscriptionId -eq $WorkflowAssociation.Id}
        
        #Terminate Workflow Instances
        ForEach ($WorkflowInstance in $WorkflowInstancesToKill) 
        { 
            Try{
                $WorkflowInstanceService.TerminateWorkflow($WorkflowInstance)
                #To Cancel workflow, use: $WorkflowInstanceService.CancelWorkflow($WorkflowInstance)
                $Ctx.ExecuteQuery()
                Write-host -f Green "Worfklow Terminated on List Item:" $ListItem.Id
            } Catch {
                     Write-host "Error terminating workflow on " $ListItem.Id " Error Details: $_"
            }
        }
    }
}
Catch {
Write-host -f Red "Error:" $_.Exception.Message
}