HomePod not showing in HOME app

I've got a first gen HomePod. One day it stopped showing up as an option for airplay. We only use it as a speaker in one room and don't have any other features activated in the HOME app so a factory reset is NOT a big deal. So that was the option I took. When I try to add the HomePod as an accessory - it can't be found. I have tried the 'hold your finger (or some say hand) on the top of the HomePod until it turns red (or white)' It doesn't respond. It seems just dead. Any ideas? AND thank you! I miss my music deperately.