Cannot used fine-tuned gpt-4.1 model to run batch job

API Bugs
1

I fine-tuned a gpt-4.1 model to complete a task. The fine-tuning succeeded and returned a model id of the form ft:gpt-4.1-2025-04-14:[org]:[suffix]:[id] which I am able to use for individual chat completions. Yet I am having trouble completing batch requests that use the fine-tuned model. The batch job returns an error file with status_code 404 and a message

{
    "message": "instance_id `gpt-4.1-2025-04-14-shared-batch` could not be found",
    "type": "invalid_request_error",
    "param": null,
    "code": "model_not_found"
}

The same batch request code successfully runs batch requests for a similarly fine-tuned gpt-4o model as well as the default (non-fine-tuned) gpt-4.1 model.

I presume the error is on my end but I can’t figure out what it is. Any help greatly appreciated.