Android app not controlling the Elite Zumo

I have mentioned in previous posts that I have an elite Zumo - the android app connected by bluetooth controls resistance in workout erg mode but does not apply any resistance in sim mode

everything works fine on windows PC using ANT+

I can also confirm this on my elite zumo.

No resistance in simulation mode on android app via Bluetooth running my pixel 3.

Works fine on iPad and windows 10 both over Bluetooth.

mine works fine in windows via Ant+

weirdly it works for erg mode in workouts so it can control resistance it is just not there for sim mode