Hello everyone, I have a problem and if anyone can help me I would be very grateful

I will try to explain in as much detail as possible, forgive me if you have any difficulty understanding my basic English

I recently bought my GDI PSO V2 NTSC US/Canada but now that I finally bought the game a few months ago I sold my Dreamcast

what I'm trying to do is use my licenses previously registered on the sylverant site to be able to connect to the server however when I input Serial doesn't work , I talked to bluecrab yesterday about it and he helped me with some information that maybe I was using a game from another region etc,but I'm not even using PSO DC Ives Pack 2.0 Torrent and the version I'm trying to run is PSOV2 US R2 Cdi, I'm running the game on the Flycast emulator, and there's a very interesting thing using these shared keys that exist on the web. I can connect to the server easily, but that's not how I want to play legitimately and participate in events any ideas on how I can do this?
thanks in advance