I had issue scanning QR Code and replacement cams had same result. I had taken a couple of screenshots of the QR Codes generated. Kenneth Rankin/Wyze Support spotted the issue as soon as I sent him the screen shots. The QR Code “window” can slide up/down and the lower part of the QR Code was cut-off, causing the problem. Notice in the screenshot, the QR Code does not have the full square in the lower left as it should. After I went thru the process again, this time sliding the QR code up, all cams connected.
