Ensure your Switch has an active, legitimate internet connection.
If you're interested in homebrew or have received an NSP file through legitimate means (like a free release for homebrew development testing), installing it requires a bit more technical know-how and specific software: diablo ii resurrected switch nsp update 102 install
) to trick the game into thinking you authenticated recently. Import the modified save back using JKSV. 3. Troubleshooting Common Issues Failed to Authenticate Ensure your Switch has an active, legitimate internet