Set Inventory Level API - inventory_item_id Required parameter is missing or invalid

Retired Boards Appdev Fulfillment Api
1

I’m trying to set my inventory levels from my ERP; I’m testing the API call using postman, and getting an error. My POST takes the form https://x.myshopify.com/admin/api/2024-04/inventory_levels/set.json, with my validation in the header (successful - I can do GETs), and the body is:

{
“location_id”: 3083239454,
“inventory_item_id”: 47452410052859,
“available”: 23
}

The response is:

{
“errors”: {
“inventory_item_id”: “Required parameter missing or invalid”
}
}

If I do a get on my product, the invnetory_item_id provided for the variant I want to set inventory level is indeed what I’m providing in my POST, so I don’t understand the error.