Connect garmin 935 wrist heart rate to iPad Pro

Hello ! 

I tried several times to connect my garmin 935 wrist heart rate to iPad Pro Zwift heart rate but couldn’t search for any heart rate signal.  I switched on AUTO in status of broadcast heart rate already.  

Wanna know if I miss any important steps ! Million thanks ! 

The Garmin 935 only transmits the heart rate over ANT+, so you will need some thing like a Lightning to 30pin adapter with a Wahoo ANT+ key or similar device to bridge the ANT+ signal.