Have used my Garmin dual HRM for almost ayear but on a ride my IPad asked if I’d like to pair the Blutooth device and I answered yes. Since then it pairs with my HRM but pulse was first 104 and now it’s 0.
I unpaired, uninstalled my Garmin Connect, re-started the IPad and finally I tried the HRM against my Garmin 1030 to check if it’s ok and it works perfectly.
So the problem must be a bug in Zwift, or?