Since last year, I noticed that sharing does not appear on my Apple Watch S2 as it used to be, even though it appears on the iPhone activity bar. I have googled for an answer, basically it's about paralyzing / pairing the clock and singing out / logging on to the iCloud account. I have done this several times and it still does not appear. I thought I got my new S4 watch, the problem will be fixed. Unfortunately, it still does not appear on Watch S4, but it's there on the activity app on iPhone. Also I have tried the same methods for unpairing and signing out of iCloud. Nothing changed. Basically, the same problem goes on.
Last week, I sent a new invitation to share activity to my friend, they have accepted it, but it still appears on Activity App on iPhone as an invitation. My friend can see my activity, but I do not see theirs. I mention this because I think it is related to the main problem.