Unable to add product inventory to "app" fulfillment location

[ShwetaS]

Hi,

I created a third party fulfillment service using REST API but when I try to associate a product with this fulfillment location, I am receiving error "Forbidden: You don't have access to this application". Are there any settings that would need to be updated on the admin page?

URL and JSON string input used for fulfillment service creation:

URL:https://testStore.myshopify.com/admin/api/2023-07/fulfillment_services.json?scope=all

JSOn string input:

{"fulfillment_service":{"name" : "Test",

"callback_url" : "https://www.test.ca/",

"inventory_management" : "true",

"tracking_support" : "true",

"requires_shipping_method" : "true",

"fulfillment_orders_opt_in" : "true",

"include_pending_stock": "true",

"permits_sku_sharing": "true",

"format" : "json"

}}

Thanks.