Newer cams do not have a passphrase for the setup network, they are just OPEN networks.

The password for connecting to the older camera setup hotspot is the same as the Wi-Fi name / SSID it brings up.

This is of the form "CAM-nnnn" where the 'n's are the last four digits of the unique camera serial number, which you can find underneath the USB power flap.

Note that the passphrase is case sensitive so remember to use put the "CAM" part in all caps!