Defect + UUID = Success / UserStory + UUID = Failure. Why?

Discussion created by techbusinessman1 on Jun 20, 2014
Latest reply on Jul 2, 2014 by techbusinessman1
I am currently using the REST API v3.0. In the application I am building, I have a need to rebuild the URL link to either the Defect or the User Story. For whatever reason the following link works: but this one does not:

Can someone help me understand why not?