As far as I know, there was never a default shorcut for these commands, which leads me to guess that you are using a custom shortcut set. Did you try to copy a set from another version? Did you check to see if you were actually using the custom set you intended?
Yes, this is a custom set and the set is assigned to be used. I also made a new set and re-programmed the shortcut to no avail (several times). If you're curious, try to make a command for it - let me know if it works (If so, it must be an anomaly).
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I don't have CC installed to test it, sorry.
You might want to try trashing the prefs, then reassign the newly made in CC shortcut set and see if it works. see Replace Your Preferences
You may also have tried to use a shortcut that is in use by the system -- lots of trouble with that on OS X, and you would need to turn those off in your system prefs.
After Googling... there is a new command used by OSX, that has a default shortcut that was indeed overriding my chosen shortcut of 'Command-Option-Shift-D'. For OSX this shortcut is now 'duplicate file exactly' in the finder and cannot be changed.
Changed my key-combination and am back to duplicating pages with ease . Thanks Peter.