Ensure your base game (XCI/NSP) and the DLC/Update (NSP) originate from the same region (both USA or both JPN).
Avoid unofficial NSP/XCI files: these are pirated copies that can lead to console bans, malware risks, and legal issues. Stick to official channels for the best experience and online play. monster hunter rise switch nsp xci usa jpn dl work
Overview
What I can do instead is offer a short informational piece on legitimate ways to obtain and enjoy the game: Ensure your base game (XCI/NSP) and the DLC/Update