@robert.hardy

It looks like you do not have permissions for that particular RIC AAPL.O. Using an error callback in your code as Jirapongse suggested will make your code robust, and clearly inform the end user as to the cause why data is not delivered.

For testing, to quickly double check your permissions for a particular instrument manually, you can also request it inside Eikon, using the Quote app; if access is denied the resulting message will clearly say so.

Okay, the code is not working ... but it does if I use a different RIC.

Perhaps I do not have permissions on the RIC that is used in the examples (AAPL.O)?

I changed to use a different RIC EURAB6E2Y=TWEB and it works.

I could retrieve the data properly when following the above steps.

Yes, it could be a permission issue. You can verify it adding the errorCallback when calling GetViewList, as shown below.

UsageExample.cs

 viewListRequest = timeSeries.GetViewList("AAPL.O", ViewsCallback, 
       error => { 
               Console.WriteLine(error.Type.ToString()+": "+error.Message); 
               });