...and it works very reliably, allowing me to show and hide Forklift in a particular location on the screen. When I started using this macro on an M2 mini, though, it will execute the first part of the macro - launching Forklift and bringing it to the front - but when I try to toggle Forklift's visibility, I get the following error:
It's difficult to be sure, since you didn't upload the macro, only a snapshot of it. Macros have things like timeout settings which we can't see if you don't upload the macro. So at this point I can only guess that your timeout setting is too low for your M2 to be able to activate the application. There are others on this website who may be able to spot the problem without seeing a copy of the macro, but apparently I'm not one of them.
Oh wait, another problem is that when you move macros to new machines, the name of the application has to be "reselected" because the path is different on the new machine. Your macro has several references to an app called Forklift. I'd say there's a 75% chance this problem is caused by a path issue which you can fix be reselecting the path in each action where the app Forklift is specified.