Add EventGridSystemTopicEventSubscription with deadletter not working with powershell

Frederic 35

I want to create an event subscription for a FunctionApp but can not find how to define the DeadletterEndpoint. My pipeline has Az module v12.5.0 installed.

The following code is working but how can I define the storage account container for deadletter?

$funcid = "/subscriptions/$funcSubID/resourceGroups/$func_rg/providers/Microsoft.Web/sites/$funcapp/functions/$func_name" $func_evdo = New-AzEventGridAzureFunctionEventSubscriptionDestinationObject -ResourceId $funcid

New-AzEventGridSystemTopicEventSubscription -ResourceGroupName $resourceGroupName ` -eventSubscriptionName $eventSubscriptionName ` -systemTopicName $systemTopicName ` -destination $func_evdo

Khadeer Ali 1,395 Microsoft Vendor

Hi Frederic,

Welcome to the Microsoft Q&A Platform! Thank you for reaching out regarding your query on how to define the DeadletterEndpoint.

To set up a dead-letter destination for your Event Grid System Topic Event Subscription, you’ll need to define a storage account container as the destination. Here’s how you can update your script to include this:

# Define the Azure Function destination
$funcid = "/subscriptions/$funcSubID/resourceGroups/$func_rg/providers/Microsoft.Web/sites/$funcapp/functions/$func_name"
$func_evdo = New-AzEventGridAzureFunctionEventSubscriptionDestinationObject -ResourceId $funcid

# Define the Dead Letter destination (Storage Account and Container)
$deadLetterStorageAccountResourceId = "/subscriptions/$funcSubID/resourceGroups/$func_rg/providers/Microsoft.Storage/storageAccounts/$storageAccountName"
$deadLetterBlobContainerName = "deadletters"
$deadLetterDestination = New-AzEventGridEventSubscriptionDeadLetterDestinationObject `
    -ResourceId $deadLetterStorageAccountResourceId `
    -BlobContainerName $deadLetterBlobContainerName

# Create the Event Subscription
New-AzEventGridSystemTopicEventSubscription `
    -ResourceGroupName $resourceGroupName `
    -EventSubscriptionName $eventSubscriptionName `
    -SystemTopicName $systemTopicName `
    -Destination $func_evdo `
    -DeadLetterDestination $deadLetterDestination

Key Points:

Replace $storageAccountName and deadletters with your storage account name and preferred container name.
Ensure Event Grid has write permissions to the container.

This could help to configure the event subscription to send unprocessed events to the specified storage container.Please refer the below documentation on the same https://learn.microsoft.com/en-us/azure/event-grid/manage-event-delivery#powershell

Let me know if you need more details!

Frederic 35 Reputation points

2024-12-12T12:19:50.9766667+00:00

This looks like the answer copilot came up with too, but I get the error "The term 'New-AzEventGridEventSubscriptionDeadLetterDestinationObject' is not regognized as a name of a cmdlet". When I search for this cmdlet there are no results. I use this documentation https://learn.microsoft.com/en-us/powershell/module/az.eventgrid/new-azeventgridsystemtopiceventsubscription?view=azps-12.5.0 and there is no parameter called -DeadLetterDestination

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