Universal Control Not Working? Here’s How to Fix It

In iOS 15.4 and macOS Monterey 12.3 (currently in beta), Apple introduced Universal Control, a feature designed to allow you to control multiple Macs and iPads with a single trackpad/mouse and keyboard. This article offers solutions to the most common problems encountered when getting Universal Control to work.
With Universal Control, you can use your main Mac's trackpad and keyboard to control additional Macs and/or iPads nearby, which means you don't need a desk cluttered up with more than one