In the question created by me in the link below, Refinit's analyst told me "Refer to the ISIN to RIC conversion with the DSS (DataScope Select) REST API article, TermsAndConditionsExtractionRequest can be used to retrieve a primary RIC for an ISIN."

https://community.developers.refinitiv.com/questions/66596/how-to-make-dss-api-fetch-the-correct-ric-from-a-l.html

What I found in the article was:

"A TermsAndConditionsExtractionRequest delivers for each input ISIN the primary RIC (except if you specified the source, see next section). It is also possible to retrieve the currency and exchange code.

A single call suffices for multiple ISINs."

My code has "TermsAndConditionsExtractionRequest" however, it is not retrieving primary RIC.

In the line below, I'm using TermsAndConditionsExtractionRequest.

var extractionRequest = new TermsAndConditionsExtractionRequest
{
    IdentifierList = InstrumentIdentifierList.Create(instrumentIdentifierList, null, false),//<- instrumentIdentifierList, validationOptions, useUserPreferencesForValidationOptions
    ContentFieldNames = new[] { "RIC", "Trading Status" }
};
 
var extractedRows = ExtractionsContext.Extract(extractionRequest).ToArray();

Evidences:

ISIN: BRBMEFBGI5M6