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I am assuming that you are referring to ek.get_timeseries()
ek.get_timeseries() can only retrieve the default view of the input instruments.
You may try rdp.get_historical_price_summaries()
Please launch CODEBOOK application and browse to /Examples/02 - Refinitiv Data Platform Library/1.1.0 - Historical Pricing example.
NDA_RAW view is part of the legacy timeseries model, which is only exposed in legacy interfaces such as Eikon .NET SDK. Historical pricing endpoint on RDP will be replacing the legacy timeseries retrieved through NDA_RAW view.