Universal control not working on two MacBook Pro's

I may be misunderstanding how Universal Control works/what it's meant to do, so hopefully this isn't a dumb question - but I think that I should be able to use my keyboard and mouse to control two MacBook Pro's that are sitting side-by-side (provided the requirements are met). - I have two MacBook Pro's - 2021 w/ M1 chip, both running macOS Monterey with no pending updates (ie, both are up to date). - Both machines are connected to the same 5Ghz Wi-Fi network, both have Bluetooth enabled and are sitting an inch apart on my desk. - Both machines are logged into the same iCloud account. - Both machines have universal control enabled under Display settings - Both machines have Hand off to iCloud enabled: - The firewall is disabled for both the machines. I think basic universal control connectivity is established - Universal control for sharing of clipboard contents works fine - I can copy/paste between the two machines. Universal Control for sharing a display works - I can see the other MacBook under Add Display and when I connect to it, I can extend my desktop from one machine on to the other (which is _not_ what I'm trying to achieve - this is basically using the second MacBook as monitor where as I want to use it as a separate machine but be able to use a single keyboard/mouse setup for both) What I'm expecting to be able to happen, is to push the mouse thru the edge of one screen and have it show up/control the other macbook - ie, be able to control the keyboard/mouse on the secondary machine from my primary machine. Should I be able to do this or am I misunderstanding what Universal Control does? Is there anything else I can try (other than rebooting the machines repeatedly and logging in/out of the same iCloud account which I have already tried on both machines).