How to read LTP for Banknifty Jan future ?

Mangesh
Dictionary ltpsbnf = kite.GetLTP(InstrumentId: new string[] { "NFO:BANKNIFTYJANFUT"});

BNFPrice = Convert.ToDouble(ltpsbnf["NFO:BANKNIFTYJANFUT"].LastPrice);


Above code gives error that "Given Key is not present in current dictionary"
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