Simply having the keys is often not enough for newer titles. You must also install the corresponding within the emulator: Ryujinx on Windows - EmuDeck Wiki
Prod keys (product keys) act as digital "passwords" that allow the emulator to decrypt your game ROMs (NSP or XCI files) before running them. Ryujinx Prod Keys v18.0.0 - Latest Product keys...
Click on File in the top-left corner and select Open Ryujinx Folder . Simply having the keys is often not enough for newer titles
Understanding Ryujinx Prod Keys v18.0.0 Ryujinx is a prominent open-source Nintendo Switch emulator, but it requires specific system files—namely and firmware —to decrypt and run game files. The v18.0.0 release of these keys corresponds to the major Nintendo Switch system update 18.0.0, which introduced various backend changes requiring updated decryption keys for compatibility with the latest games. What are Ryujinx Prod Keys? Understanding Ryujinx Prod Keys v18
To set up or update your keys in Ryujinx, follow these steps: Launch the emulator on your PC.
Without these keys, the emulator cannot read the encrypted game data provided by the console.
While often mentioned together, "title keys" are typically generated automatically or included alongside prod keys and are specific to individual games. How to Install Prod Keys v18.0.0