REST Admin API 200 Response for POST Creates a fulfillment for one or many fulfillment orders

Retired Boards Appdev Fulfillment Api
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Hi All,

I’m looking to get some help on being able to set orders to fulfilled in Shopify as well as uploading the tracking number for customers.

I am using REST Admin API and the associated Shopify API documentation.
I have read every relevant thread on here regarding fulfillment orders including the other 200 response thread for my exact POST method. I have also granted my app every fulfillment permission as per the guide.

write_assigned_fulfillment_orders
read_assigned_fulfillment_orders
write_fulfillments
read_fulfillments
write_merchant_managed_fulfillment_orders
read_merchant_managed_fulfillment_orders
write_third_party_fulfillment_orders
read_third_party_fulfillment_orders
write_custom_fulfillment_services
read_custom_fulfillment_services
write_fulfillment_constraint_rules
read_fulfillment_constraint_rules

Here is what I’m doing:

Step 1:

GET https://{STORE}.myshopify.com/admin/api/2024-07/orders/6161467277373/fulfillment_orders.json
Response:

{
    "fulfillment_orders": [
        {
            "id": 7246309392445,
            "created_at": "2024-09-08T00:13:30-04:00",
            "updated_at": "2024-09-08T00:13:30-04:00",
            "shop_id": SHOPID,
            "order_id": 6161467277373,
            "assigned_location_id": 61232087101,
            "request_status": "unsubmitted",
            "status": "open",
            "fulfill_at": "2024-09-08T00:00:00-04:00",
            "supported_actions": [
                "create_fulfillment",
                "hold"
            ],
            "destination": {
                "id": 6621389127741,
                "address1": "123 Street",
                "address2": null,
                "city": "City Name",
                "company": null,
                "country": "United States",
                "email": "MyEmail",
                "first_name": "NAME",
                "last_name": "NAME",
                "phone": null,
                "province": "STATE",
                "zip": "ZIP"
            },
            "line_items": [
                {
                    "id": 14610494062653,
                    "shop_id": SHOPID,
                    "fulfillment_order_id": 7246309392445,
                    "quantity": 1,
                    "line_item_id": 14420625883197,
                    "inventory_item_id": 41638113640509,
                    "fulfillable_quantity": 1,
                    "variant_id": 39542918578237
                }
            ],
            "international_duties": null,
            "fulfillment_holds": [],
            "fulfill_by": null,
            "delivery_method": {
                "id": 1446810157117,
                "method_type": "shipping",
                "min_delivery_date_time": null,
                "max_delivery_date_time": null,
                "additional_information": {
                    "instructions": null,
                    "phone": null
                },
                "service_code": "custom",
                "source_reference": null,
                "branded_promise": null
            },
            "assigned_location": {
                "address1": "ADDRESS",
                "address2": "",
                "city": "CITY",
                "country_code": "US",
                "location_id": 61232087101,
                "name": "NAME",
                "phone": "PHONE",
                "province": "STATE",
                "zip": "ZIP"
            },
            "merchant_requests": []
        }
    ]
}

Step 2:
Extract fulfillment_orders id for Step 3:

fulfillment_orders": [“id”: 7246309392445]

Step 3:
I am using https://shopify.dev/docs/api/admin-rest/2024-10/resources/fulfillment#post-fulfillments and the example: Create a fulfillment without tracking info. Tracking numbers can be set later with the /admin/api/API_VERSION/fulfillments/FULFILLMENT_ID/update_tracking.json endpoint.
I am copying the POST and example directly from Shopfiy docs and only updating the order id.

POST https://{STORE}.myshopify.com/admin/api/2024-10/fulfillments.json
BODY:

{
    "fulfillment": {
        "line_items_by_fulfillment_order": [
            {
                "fulfillment_order_id": 7246309392445
            }
        ]
    }
}

RESPONSE:
200 OK

Can anyone help me troubleshoot why I’m getting a 200 response.
Am I using an incorrect method somewhere?
Am I passing an incorrect ID?

Am I missing a step?
As you can see my test order was created beginning of September, so I have been going at this for a while.