Proper Zwift sync w/Treadmill/Epix ?

Having a Zwift compatible Toorx treadmill, running Zwif on iPhone, I tried to sync all w/Epix (Virtual run). Thus I intended to get pace from treadmill to Epix and get heartrate from Epix to display on Zwift.
Unfortunately it seems I cannot connect both at least properly. Although Zwift "sees" both paired device (see pic), I could pick only one of them (see pic). How could it be solved?