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: Physical printers.
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.
If you have a question about something that isn't covered here, check out our additional resources.
And if that doesn't do the trick, you can send an inquiry to firstname.lastname@example.org or through the button below.