Because the mod alters game files, it desyncs from any unofficial private servers. You can only play against the AI.
While the is tempting, there are three risks you must understand: Yu-gi-oh Duel Generation Mod Unlock All Cards -UPD-
A: Usually due to missing or incorrect OBB files. Ensure the OBB folder name exactly matches com.konami.ygodg . Because the mod alters game files, it desyncs