@thrawn86 said in WiFi reported error: Failed while trying to connect:

It didn't seem to be a problem on my older duet with internal antenna.

all it takes is a new neighbor, its very unlikely both boards had a fault. maybe wifi and/or internal antenna isn't the best option for your location. (ed: or your router may be among a few that have shown to be incompatible with the ESP8266 chip, but if you haven't changed the router then odds are your environment changed. i.e. (new) neighbor with new wifi router causing poor signal)