Pairing Garmin HRM

I am new at Zwift. First ride yesterday. Everything is OK except HRM that i can’t pair.
Saris H3 / iPad Pro / Garmin HRM (735 XT)
Anybody can help me ?

Your Garmin watch is only broadcasting your HR over ANT+, and your iPad doesn’t have ANT+, only Bluetooth. I suggest buying a dual BT/ANT+ chest strap HRM, which will give you a more accurate HR anyway.