i don't receive messages in eventhub

Hello ,
when i send csv file to eventhub i receive requests but no messages
how can i handle this problem
this my code
import asyncio
from azure.eventhub.aio import EventHubProducerClient
from azure.eventhub import EventData

async def run():
producer = EventHubProducerClient.from_connection_string(conn_str=connection_str, eventhub_name=eventhub_name)
async with producer:
# Create a batch.
event_data_batch =producer.create_batch()
for claim in (json.loads(data.to_json(orient="records"))):
event_data_batch.add(EventData(claim))
# Send the batch of events to the event hub.
await producer.send_batch(event_data_batch)
producer.close()