The printer is displaying the message: Please turn on the HTTP digest (which is the recommended security option) or update the API key. You can find it in Settings > Network > Login credentials.
Error name: Invalid API key
Error code: #10405
This error shows when the print is sent directly from PrusaSlicer, and the API key is incorrect.
Verify your API key with this guide: Sending G-codes to printer via network (PrusaConnect, PrusaLink, Octoprint).
In the printer menu, go to Settings -> Network -> Login credentials. Check if the API key inserted there is the same as the one in PrusasSlicer.