This process is seamless for legitimate users but creates a barrier for those using unauthorized backups, as the eShop will refuse to serve update files to consoles or software that cannot pass the verification checks.
Every Switch game has a unique Title ID. nexomon switch nsp update eshop work
Ensure automatic updates are enabled
However, it will never "work" with the eShop itself. Treat the update as an offline patch. Install the base game, install the update via DBI/Tinfoil, set Atmosphere to block Nintendo servers (via exosphere.ini and dns.mitm ), and enjoy catching those cosmic monsters. This process is seamless for legitimate users but