DeepLens v1.0 unable to connect to WiFi

I just bought a used 2017 DeepLens (v 1.0) and tried to register it following instructions. Successfully connected to the camera's WiFi and got stuck on connecting the camera to home WiFi: after selecting the network and entering the password, the process gets stuck indefinitely, with the middle diode blinking. No error message is displayed, the camera doesn't connect to WiFi, "next" button is white with a moving progress "circle".

I already triple-check that I am using the correct password (even copied it from the keychain to be sure) and tried de-registering the failed attempt and registering again.

Is there anything else I should try to register the device?