To protect your console and account, avoid connecting to official Nintendo servers while using modified software to prevent a potential ban.
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. nexomon switch nsp update eshop work