Universal Apple Mail message URL

Use a simpler script:

tell application "Mail"
	set the theMessage to item 1 of (get selection)
	set theID to the message id of the theMessage
end tell

set theURL to "message:%3C" & theID & "%3E"
set the clipboard to theURL
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python is no longer part of macOS base, you have to install the Command-line Tools, and you will have to use python3 instead of python. I don’t think the script needs to change.

xcode-select --install