Hate to jump in late, but your switch was probably fine. There is a thread where people are seeing this issue:
I had the same issue with some non GE stuff. I just toggled it at the switches and it cleared the unavailable thing in the app.
I know from personal experience I had one HE!! of a time getting one of mine to reconnect. I had to call support and have them walk me through it. It was for a different issue but they had me remove / exclude it and we had a hard time getting it back on.
I’m sure you have been here. This is where I started when I was trying to get mine to work.
Hope you get it back up and working.