@lobsterghost
I tried every suggestion from my MacBook, my iPhone, and on my Apple Watch 4 - NOWHERE was I able to add the Noise icon back to my watch. I was able to set it (through Settings on my Watch) to NOTIFY me of hazardously loud noise (duh - I don't need a watch to tell when it's that much too loud), but I cannot see the icon itself anywhere under the "My Watch" tab. Not under "installed" or "available". I can see it on my iPhone's available apps for Apple Watch, but it says it can only be downloaded on Apple Watch, and I can't find where to download onto my watch.
I used to have it set as a complication on my watch face, which in my line of work, I found very useful. Then I did an iOS upgrade, and there was a blank spot where the complication used to be. I have never since been able to restore it. I'm running iOS v. 8.1 which should give me the option. This is very frustrating. VERY frustrating. Should I Reset Sync Data? Since the Noise app isn't available on my iPhone 12, I don't see how re-syncing could restore it. Erase? I have no idea what to do. I just bought a new MacBook and iPad and am not really feeling like buying a new watch at the moment. can you help??