I’m a little unclear on what you want the Pixel to do. Are you running the Zwift Companion app on the Pixel and using that to connect to the game app running on the Macbook?
If that’s the case: the Pixel and the Macbook both need to be on the same WiFi network. They use WiFi to connect to each other, not Bluetooth.
Also see this article on support.zwift.com to solve some other issues with Zwift Companion.