You must also install the matching v21.0.1 Firmware through the Tools > Install Firmware menu for full compatibility. For Yuzu: Open Yuzu . Navigate to File > Open Yuzu Folder . Open the keys folder and drop the prod.keys file inside.
Open your emulator (Yuzu or Ryujinx) and go to File > Open [Emulator] Folder . Find the 'keys' Directory: Look for a folder named keys . prod keys v2101
This usually means your Prod Keys are older than the firmware or game update you are trying to use. Upgrade to V2101. You must also install the matching v21