This post gives a sequence of steps that ensure that Zwift running on a Window's PC talking to the Companion App running on Android always starts with a connection to the Wahoo cadence, speed and heart rate sensor.
1. Start Zwift on the Windows PC
2. Start the Companion App on Android
3. Pedal the pedals by hand and put on your heart rate monitor
You should see:
You have about 30 seconds to start riding.
4. Quickly click OK
You should see something like:
5. Click RIDE
6. Get on your bike and start pedalling!