macOS 10.15.5.1 Catalina. Have toggled Accessibility in SysPref->Security.
Symptoms: Macro was triggered, and results appear in the Clipboard, but nothing happens in TextEdit: the trigger is not erased, and nothing is pasted. This is true of several macros.
10.15.5 added something new in Security: Input monitor. But Keyboard Maestro does appear there, and cannot be added.
I will try deleting KM and rebooting, then reinstall.