Can't accept Activity Sharing invitation.
I have an Apple Watch Series 1 and an iPhone 6. My wife invited me to share activity with her through the activity app on her iPhone. I can see the invitation in my Activity app, but when I click accept she shows up as a connection for a few seconds, then disappears. Her invitation goes back to "Awaiting Your Reply". Both of our iPhones and Apple Watches are on the latest versions of their respective OS.