Re: Microsoft Health Error OOps an unknown error occured with your band.
I was getting this error on my L950 after installing the most recent pre-Redstone update and it continued once I updated to Redstone and also have never had a band attached.
I managed to fix it by going to Settings > Privacy > Motion and setting it to Off, then I uninstalled MS Health app and restarted. I then reinstalled Health and when I opened it for the first time it asked me if I wanted to allow motion data so I clicked yes and the next time I opened the app it did not have the error and it was tracking steps and calories again.
The privacy motion settings are still set to off but health is working. If I re-enable it I got the error in health again.