Multiple Indoor Cams won't complete setup - Ready to throw them out!

I've been trying to set up two indoor cams, neither will complete setup. Sometime it fails connecting to the wifi, sometimes it gives me a "device is registered to another owner". I'm seriously ready to throw both of them in the trash. They worked fine up until a few days ago. The help articles are worthless, written for a total imbecile. I know how to check if it's powered on, seriously? I also relocated the device to within a few feet of the wireless access point. I have multiple wireless zones with many devices attached, these are the only ones that don't work. I've tried all different ways of completing the setup, it fails in different ways each time. So annoying, ready to switch to a whole other product line.