MacOS – Can’t find the Automator service action in the Keyboard Shortcuts list

I don't have the keyboard shortcut, but I just finished an Actionscript that adds the email Subject as the Reminder Title, the email Body as the Reminder Content and then adds a link to the actual email at the bottom of the Reminder. Hope this helps!

on run {input, parameters}
tell application "Calendar" to activate
tell application "Calendar"
    set miniaturized of window 1 to true
    tell application "Mail"
        set theSelection to selection
        set theMessage to item 1 of theSelection
        set theurl to "message://%3c" & theMessage's message id & "%3e"
        set thedes to theMessage's content & "Show in Mail " & "message://%3c" & theMessage's message id & "%3e"
        set input to theMessage's subject
    end tell
end tell
tell application "Calendar"
    tell application "Reminders"
        make new reminder at end with properties {name:input, body:thedes}
        tell application "Reminders" to activate
    end tell
end tell
return input

end run

Have a look at Folder Actions Setup.

You can open this by right-clicking on any folder in your home folder, choose "Services > Folder Actions Setup ...".

You can also find it here: /System/Library/CoreServices/Folder Actions Setup.app