"Trigger flow for each entry" not working

I've read this article on how to trigger a flow for each entry in my array.

https://help.zoho.com/portal/en/kb/flow/user-guide/create-a-flow/articles/webhook-trigger#Trigger_flow_for_each_entry

I cannot get the flow to run for each variant in this JSON I'm sending via webhooks.

{
	"webhookTrigger": {
		"payload": {
			"variants": [
				{
					"inventory_quantity": 0,
					"inventory_management": "shopify",
					"fulfillment_service": "manual",
					"taxable": true,
					"old_inventory_quantity": 0,
					"requires_shipping": true,
					"created_at": "2020-01-10T16:16:13+11:00",
					"weight": 0,
					"title": "100 units",
					"inventory_policy": "continue",
					"updated_at": "2023-06-09T12:05:58+10:00",
					"weight_unit": "kg",
					"inventory_item_id": 32947594494017,
					"price": 160.00,
					"product_id": 4374187606081,
					"admin_graphql_api_id": "gid://shopify/ProductVariant/31353590841409",
					"option1": "100 units",
					"id": 31353590841409,
					"position": 1,
					"sku": "292470-1",
					"grams": 0,
					"barcode": ""
				},
				{
					"inventory_quantity": 0,
					"inventory_management": "shopify",
					"fulfillment_service": "manual",
					"taxable": true,
					"old_inventory_quantity": 0,
					"requires_shipping": true,
					"created_at": "2020-01-10T16:16:13+11:00",
					"weight": 0,
					"title": "250 units",
					"inventory_policy": "continue",
					"updated_at": "2023-06-09T11:56:47+10:00",
					"weight_unit": "kg",
					"inventory_item_id": 32947594526785,
					"price": 275.00,
					"product_id": 4374187606081,
					"admin_graphql_api_id": "gid://shopify/ProductVariant/31353590874177",
					"option1": "250 units",
					"id": 31353590874177,
					"position": 2,
					"sku": "292470-2",
					"grams": 0,
					"barcode": ""
				},
				{
					"inventory_quantity": 0,
					"inventory_management": "shopify",
					"fulfillment_service": "manual",
					"taxable": true,
					"old_inventory_quantity": 0,
					"requires_shipping": true,
					"created_at": "2020-01-10T16:16:13+11:00",
					"weight": 0,
					"title": "500 units",
					"inventory_policy": "continue",
					"updated_at": "2020-08-03T15:42:15+10:00",
					"weight_unit": "kg",
					"inventory_item_id": 32947594559553,
					"price": 450.00,
					"product_id": 4374187606081,
					"admin_graphql_api_id": "gid://shopify/ProductVariant/31353590906945",
					"option1": "500 units",
					"id": 31353590906945,
					"position": 3,
					"sku": "292470-3",
					"grams": 0,
					"barcode": ""
				},
				{
					"inventory_quantity": 0,
					"inventory_management": "shopify",
					"fulfillment_service": "manual",
					"taxable": true,
					"old_inventory_quantity": 0,
					"requires_shipping": true,
					"created_at": "2020-01-10T16:16:13+11:00",
					"weight": 0,
					"title": "1000 units",
					"inventory_policy": "continue",
					"updated_at": "2023-06-09T12:01:57+10:00",
					"weight_unit": "kg",
					"inventory_item_id": 32947594625089,
					"price": 830.00,
					"product_id": 4374187606081,
					"admin_graphql_api_id": "gid://shopify/ProductVariant/31353590939713",
					"option1": "1000 units",
					"id": 31353590939713,
					"position": 4,
					"sku": "292470-4",
					"grams": 0,
					"barcode": ""
				},
				{
					"inventory_quantity": 0,
					"inventory_management": "shopify",
					"fulfillment_service": "manual",
					"taxable": true,
					"old_inventory_quantity": 0,
					"requires_shipping": true,
					"created_at": "2020-01-10T16:16:13+11:00",
					"weight": 0,
					"title": "2500 units",
					"inventory_policy": "continue",
					"updated_at": "2023-06-09T12:10:51+10:00",
					"weight_unit": "kg",
					"inventory_item_id": 32947594657857,
					"price": 2000.00,
					"product_id": 4374187606081,
					"admin_graphql_api_id": "gid://shopify/ProductVariant/31353590972481",
					"option1": "2500 units",
					"id": 31353590972481,
					"position": 5,
					"sku": "292470-5",
					"grams": 0,
					"barcode": ""
				}
			]
		}
	}
}

My webhook settings in flow: