Hi @Moderator_2
Thank you for the response.
In the Instrument file, for name == 'BANKNIFTY', there were two rows. One with blank InstrumentType and the other one with 'AMXIDX' as it's value. I was passing the token from the first one. But in documentation or somewhere it should be mentioned that if we want index then which one to consider.
Thanks and Regards,
Aditya