I recently bought the Speed Sensor 2 and Cadence Sensor 2 separately, so not together.
I use them on Zwift with mixed success.They both to broadcast on bluetooth as the Zwift Comanion app picks them both up.
My Garmin Edge 810 picks up the Speed sensor but not the Cadence sensor.
I tried pairing using Garmin connect and it fails
What am I doing wrong?