I cannot use the Fulfillment api to create a shipping process!I need help!!

Shopify returned data “errors”: “Not Found” when using Fulfillment api recently, I don’t know what happened.
It was still usable half a month ago.

/Admin/api/2021-04/orders/{order_id}/fulfillments.json in the document
Only the first one can be called, but this is not what I want.

Below is my request address