symbology (sedol to ric)

I am getting 'No best match available' on many sedols although I can get Rics using excel plugin

=TR('BWY54W4','TR.RIC')

Any suggestions?

-------------------------------------- code to reproduce -------------------

import eikon as ek
import pandas as pd

sedols = ['BWY54W4','B17MT31','BD60093']
data=ek.get_symbology(sedols, from_symbol_type='SEDOL', to_symbol_type=['RIC']);