Kindly let know is it something I am missing from the docs. Because not only the above instruments, but tried serveral others with varied dates ( not dated more than 2 year ) but still, results are very incosistent for given ranges. Sometimes data is returned and sometimes not for a given range, but when cross verified the trade did occur for given instrument / security. Also verified against the day data using the same api call, replacing the interval from 'minute' to 'day'.
We have informed the data team. They are looking at it.