I am using this code to get price data on expired option NDXb1921A5075.U^B21:
df5 = ds.get_data(tickers="<NDXb1921A5075.U^B21>", fields=['MP'], start = '2021-01-01', end = '2021-09-18', freq= 'D' )
According to the RIC rules this option should have been expired on February 19, 2021, however the code above returns price data for up to today (see attached)
And a similar request in Eikon API returns "no data available for the requested period".
Could you please kindly consult on this ?