Get the curreny of a delisted stock

Hello,

i am trying to load timeseries with currency for a delisted stock, my example here is AGN^E20. The following works:

ek.get_timeseries(ric, 'CLOSE', start_date=fromdate, end_date=todate, interval='daily')

But if I want to get the corresponding currency, the code fails:

ek.get_data(ric, 'CF_CURR')

Any idea of how to solve this problem? Thank you!