BO Not accepting BANKNIFTY18NOVFUT as valid instrument trading symbol

I am trying to post BO orader for bank nifty future.

Here is the data I am posting to zerodha using API calls.


And in return I get following error.

{"status":"error","message":"Unknown instrument","data":null,"error_type":"InputException"}

I have taken the trading symbol from the CSV file which I have downloaded using API call.

Kindly help me with this as I am struggling on this since couple of days.

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