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You can self sign and view and download the API documentation, but you will need to talk to a Refinitiv account manager to get a trial ID.
You can have a Refinitiv person contact you and discuss the trial details here.
PS: Can you please paste the complete link to the quickstart that is not working for you. I can access the RDP Library Quickstart just fine.
Now it works and I registered my app but I still didn't receive any email while registering for Eikon data to get the required credentials.
If you have signed up for an Eikon Trial or full Account, then you can create a Desktop session with the RDP library to consume streaming data from Eikon.
and then follow the C#/.NET specific sections
You will off course have to have Eikon running on the same PC where you run the C# code.