Hi @an_na, welcome to the forums. Looks like you need some sort of a converter, probably to make the bluetooth signal open so Zwift can use it.
From the website:
The M3i connects to many popular cycling apps to enhance your workout experience. The included M Series Converter provides access to a wide variety of compatible cycling apps, including Peloton (converter optional), Zwift, The SufferFest, TrainerRoad, Rouvy, and more.