"Trigger flow for each entry" not working

"Trigger flow for each entry" not working

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

I cannot get the flow to run for each variant in this JSON I'm sending via webhooks.
  1. {
    	"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:





Pushing the array to a sheet, i've tried multiple ways of refrecning the the array.  



What the output end up like:




So this works for the first set. but obviously only doing this once, not for each
${webhookTrigger.payload.variants[0].sku}

This returns NULL:
${webhookTrigger.payload.variants.sku}

How can i get this to run for each of the array variants>