I am trying to use Rest SubscriptionTransportMedium in my custom data setup. Attached you can find the algo.

I am getting the error. It says Runtime Error: KeyNotFoundException : 'RADFDATA.Radf' wasn't found in the Slice object, likely because there was no-data at this moment in time and it wasn't possible to fillforward historical data. Please check the data exists before accessing it with data.ContainsKey("RADFDATA.Radf")

It is the strange error becuase, for test, I use always the same url, which always returns the same output.