OK, tried it now with your full text, and it gives me the same “No Text in Clipboard”. As you have stated, it works fine in TextEdit. I cut your text to the first third or so, and it worked again.
Reminds me of another recent problem with “No Text in Clipboard”.
What you can do: Try to find out if the issue depends on the length of the text, or on any special chars in the text, or on any other condition.