Ring Chime 2nd Generation won't flash green to allow setup

I bought a used Ring Chime second generation off eBay, and I'm trying to set it up. When I plug it in, it shows a solid green light after a few seconds. When I hold down the button for five seconds as the app suggests, it goes off, and then comes back on solid green.When I hold the button down for a long time (over 20 seconds) and release, it goes off, and then comes on blinking blue. The blue blinking continues basically forever, until I unplug it.Is there something I am missing here? How do I get it to flash green to go into setup?Thanks in advance!Rick