I never did get it resolved. Can’t use the camera. I think the issue is
if you buy a used camera you’ll never be able to connect it to your own
Wi-Fi. It’s just a guess on my part but I’ve heard it before.
I have the exact same problem. It asks for the last four digits in the
serial number and then there’s no place to enter it. These cameras are
pieces of junk. If anyone reads this don’t buy a Google camera anymore
when they were Dropcam’s they worked ...