Invalid API key #10405 (SL1/SL1S)

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What happened?

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.

How to fix it?

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.