After some trial and error and observing the results (in other words, I hacked it), I got it to work.
Quotes ARE required to use a path name with spaces. The trick is there MUST be a space after the path names before the closing quote…like this…
robocopy "C:\Source Path " "C:\Destination Path " /option1 /option2...
This almost seems like a bug and certainly not very intuitive.
Todd K.