Error: 400 - {\"s\": \"error\", \"code\": -50, \"message\": \"Please provide valid symbols\"

call = \"BUY\"

lot_size = 1

user = self.stand_in_angel_queue()

#url = \"https://api.fyers.in/api/v2/marketdata/margin_calculator\"

url = \"https://api.fyers.in/api/v2/span_margin\"

# Prepare the request headers (with access token)

headers = {

\"Authorization\": f\"WHDWPWMYF5-100:{global_variable.smart_api_object_list[user][\"accessToken\"]}\",

\"Content-Type\": \"application/json\"

}

data = {

\"data\": [

{

\"symbol\": \"NSE:HDFC-EQ\",

\"qty\": 50,

\"side\": 1,

\"type\": 2,

\"productType\": \"INTRADAY\",

\"limitPrice\": 0.0,

\"stopLoss\": 0.0

}

]

}

print(f\"url {url}\")

print(f\"headers {headers}\")

print(f\"margin_request {data}\")

#response = requests.post(url, headers=headers, data=json.dumps(margin_request))

response = requests.post(url, headers=headers, json=data)

url https://api.fyers.in/api/v2/span_margin

headers {'Authorization': 'WHDWPWMYF5-100:eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.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.UQtl6tjvS_yBL-A5ErC8GU4MQ9OXjRIFD26cbBGsMZM', 'Content-Type': 'application/json'}

margin_request {'data': [{'symbol': 'NSE:HDFC-EQ', 'qty': 50, 'side': 1, 'type': 2, 'productType': 'INTRADAY', 'limitPrice': 0.0, 'stopLoss': 0.0}]}

Error: 400 - {\"s\": \"error\", \"code\": -50, \"message\": \"Please provide valid symbols\"}

can some one help me

Any API Call in Python to find Margin Required?