Solid Green Light - Chime 2nd Gen

I was previously able to set up our Chime 2nd gen, but it stopped working and I noticed a solid green light in the top left when I plug it in. I've tried the reset button, and I've tried unplugging for a long period and then plugging back in, but it always goes back to the solid green light and I can't connect it on the app. Any ideas? I just can't get it to pulsing green to reconnect on the app.