Market Data Feed V3 not working for Indexes

I am trying to fetch market feed for instruments. It is successfully connecting and fetching live ticks for all instruments apart from index instruments.
Below are the 3 indexes intrument_key which i am trying:

  1. NSE_INDEX|Nifty 50
  2. NSE_INDEX|NIFTY MIDCAP 150
  3. NSE_INDEX|NIFTY SMLCAP 250