OK - I found the bug and I found the workaround and it truly has nothing to do with you. I have to say the keyboard manager is flakey.

Here is the bug: Joplin itself has a conflict with Hide Joplin, You don't see it until you change a regular shortcut, and it will give you this error message:

So I change Hide Joplin to Cmd-Shift-H and magically the plugins also started working. There is no error message at all if you change a plugin shortcut.

The interesting thing is as I was figuring it out all of the plugin shortcuts disappeared completely (several times) and I had to restart Joplin to get them to come back.

I have to figure out how to file a bug.

Bug filed: Plugin shortcut options editor fails without proper error message #8559