Automator "Watch Me Do" action can't be allowed in "Security and Privacy" preferences.

edit: I'm on High Sierra

SOLVED!

Found answer on StackOverflow, and that guy (Palimondo) found it on Reddit, and that guy (EthanDMatthews) said he found it elsewhere.

Answer:

Make sure your app is saved and closed.

Make sure Automator is closed.

In System Preferences> Security and Privacy> Privacy pane> Accessibility (on left)> edit app list (on right),

If present, REMOVE Automator and Your App USING THE (-) BUTTON.

then ADD both back in USING THE (+) BUTTON.

It took me 2 tries, but worked.

Objective: add new Automator apps to Privacy & Security > Accessibility section.

How? It doesn't appear when you save the Automator app.

Solution 1: Add the app using the "+/-" buttons at the bottom (but may not work).

Solution 2: First run the app. It will open but fail and give the error message prompt. Then check again under:

Privacy & Security > Accessibility

It should be there now. Flip the switch to blue and it should now work.

(that was unnecessarily convoluted and frustrating)

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Frustrating quirk:

Finally got the app working, then decided to make one small edit. It stopped working and threw the error dialog. I couldn't add it by either of the two methods, even if I duplicated the app and/or renamed it.

Eventually, I got it to work again by exporting the updated app from Automator under a new name, THEN following the above steps again.