@natuser It says 'Bad parameter in M587 command' at the top of the image you posted. You are probably not sending the M587 command correctly. Make sure you use straight quotes like " rather than curly quotes.
See https://docs.duet3d.com/en/How_to_guides/Getting_connected/Getting_connected_to_your_Duet#configure-network-ssid-and-password for an example of M587.
Ian