Still Can't Get Copy to Clipboard to Work

OK, thanks for posting your macro.
It works fine for me running KM 9.0.2 and Mail 12.4 (3445.104.11) on macOS 10.14.5 (Mojave).

So, maybe it is a Mojave issue. If you are running Mojave:

  1. Please see Accessibility Permission Problem assistance.
  2. Resolving Issues Due to macOS Mojave

You can also use the KM Interactive Help wizard:
by choosing Help ➤ Interactive Help menu

If you still can't make these macros work, then try each of these, one at a time, in this order:

  1. Create a new Macro Group with Global Access, and move one of your macros there
    • Then test
  2. Restart the KM Engine
    • Form the KM Editor, File > Quit/Start Engine
  3. Restart your Mac
  4. Start your Mac in Safe mode