your jsonl file should contain lines like this one:

{"custom_id": "task-1", "method": "POST", "url": "/chat/completions", "body": {"model": "REPLACE-WITH-MODEL-DEPLOYMENT-NAME", "messages": [{"role": "system", "content": "You are an AI assistant that helps people find information."}, {"role": "user", "content": "When was the first XBOX released?"}]}}

in the body you can see a model parameter, it should be changed to the deployement name,

gpt-4o-mini-bt

in my case.