I have tried to pair many times.
I have a Garmin Ant stick, but that doesn't appear to be picking up the vivofit 4on Window 10 either.
Restarting Bluetooth on the phone (several times) hasn't picked up the vivofit, but it does see many other bluetooth devices in the area. I have paired other devices (including my car) with the phone, so the phone is not the problem.
What other tricks can I try?