u/Euphoric_Two_9309

Hi all,
My HRM is connected to Zwift. Both HRM and Zwift are connected to Garmin Connect. I also have the fenix Watch which I Wear to Track the activity minutes, although it never measures my heart rate correctly while training.
My question, do I need my fenix watch at all using zwift? Do I need it while doing an outdoor training and having the hrm on?

Thank you for your help