Just to let everyone know that Connect Mobile works OK with the new iOS 11 beta but no notifications are sent to the watch.
Cheers
This workaround seems to be working consistently now in beta 4: Settings > Bluetooth > Forerunner 935 > Forget This Device, then re-add from Other Devices (at bottom of Bluetooth page) Don't mess with GC.
I should clarify. I originally added the device (FR 935) in GC, but when I lost notifications, except for phone calls and voicemails, all I did was forget the device in bluetooth and re-add from other devices in bluetooth settings. It would quickly prompt me to pair and 935 would pop-up a passkey.
Hopefully that clarifies...