To get Yuzu functional, you must place your keys in the emulator's internal folder system: Go to File > Open Yuzu Folder .

Completely close and restart Yuzu for the changes to take effect. Vital Considerations

Modern game consoles like the Nintendo Switch use complex to protect their operating system and games. Prod.keys (Production Keys) act as the digital "passwords" that allow an emulator like Yuzu to decrypt and run Switch software.

Without these keys, the emulator cannot read the game files or the console's firmware.