I just bought two new Wahoo Cadence and Speed sensors. I can see that both sensors are connected, and both report numbers when you look at them in the Sensor menu. But the Speed only shows up as N/A. I can get Cadence to work. iPhone 6S, iOS 12.3.1
Beginning to regret this purchase. I'll call them tomorrow.
If there is some secret sauce here, please let me know ... I've turned everything off and on, forgotten sensors, re-paired, reloaded the app ... no change. I get cadence, but N/A for speed. Distance is working and again, I see speed in the sensor info when I spin the wheel, so the sensor is working ... it just just does not show up in the app. Yes, in the Cycling profile the speed and cadence sensors are selected.
I think the app is the problem.