I did all the steps:
Created the .storekit file;
Synchronized, all products appear correctly from App Store;
Selected the .storekit configuration file in scheme's run options;
When I want to retrieve the 3 products via SKProductsRequest, I get none, and in Console I see
'Returning 3 products, 0 invalid identifiers'
but
'Skipping product *** because no price was available'.