Mine stopped showing anything on iphone activity app when I swapped out one iphone 6s plus for another ( silver to rose gold). I have rebooted everything, repaied, wiped my phone and reinstalled. Had apple tech phone support do a forced reinstall of iphone. Reset up watch as new, reset up watch from back up. Nothing has worked. Tomorrow I may swap one watch for another ( in two week window) since it maybe somehow a new watch might fix it. Open to ideas.