loop start a workflow on sharepoint online using powershell csom

startworkflow.ps1

# Add references to SharePoint client assemblies and authenticate to Office 365 site - required for CSOM
Add-Type -Path “C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll”
Add-Type -Path “C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll”
Add-Type -Path “C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.WorkflowServices.dll”

# Specify tenant admin and site URL
$SiteUrl = "mysiteurl"
$ListName = "mylistname"
$UserName = "myusername"
$SecurePassword = ConvertTo-SecureString "mypassword" -AsPlainText -Force

# Bind to site collection
$ClientContext = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
$credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($UserName, $SecurePassword)
$ClientContext.Credentials = $credentials
$ClientContext.ExecuteQuery()

# Get List
$List = $ClientContext.Web.Lists.GetByTitle($ListName)
$ClientContext.Load($List)
$ClientContext.ExecuteQuery()

# Create WorkflowServicesManager instance
$WorkflowServicesManager = New-Object Microsoft.SharePoint.Client.WorkflowServices.WorkflowServicesManager($ClientContext, $ClientContext.Web)

# Connect to WorkflowSubscriptionService
$WorkflowSubscriptionService = $WorkflowServicesManager.GetWorkflowSubscriptionService()

# Connect WorkflowInstanceService instance
$WorkflowInstanceService = $WorkflowServicesManager.GetWorkflowInstanceService()

$ClientContext.Load($WorkflowServicesManager)
$ClientContext.Load($WorkflowSubscriptionService)
$ClientContext.Load($WorkflowInstanceService)
$ClientContext.ExecuteQuery()


# Get WorkflowAssociations with List
$WorkflowAssociations = $WorkflowSubscriptionService.EnumerateSubscriptionsByList($List.Id)
$ClientContext.Load($WorkflowAssociations)
$ClientContext.ExecuteQuery()

# Prepare Start Workflow Payload
$EmptyObject = New-Object System.Object
$Dict = New-Object 'System.Collections.Generic.Dictionary[System.String,System.Object]'

# Loop Start Workflow
For ($j=0; $j -lt 10; $j++){
$Action = $WorkflowInstanceService.StartWorkflow($WorkflowAssociations[0], $Dict)
$ClientContext.ExecuteQuery()
}