Bookmarked this discussion so I could come back to it today when I had more time.
I deleted the ON app and rebooted both my phone and watch. I find the easiest for me is the triple click option. Able to control the aids from there with no problem except when I go to the tv adapter which defaults to 84 on the vol scale! I manually turn them way down and then they work great.
As far as the watch goes I think jcw11 might have hit the nail on the head with the problem being the newer watches. I also have a 7 running 8.4.2 and get nothing but the same results he does, which is a headphone volume screen that controls nothing!
I doubt if 15.4 will help anything since I am currently on the 15.4 release candidate. I can live without the watch control feature since we have the phone capability and the manual buttons already. The ON app is now the OFF app as far as I’m concerned.