Autodiscover is working on Exchange 2013 but there is no such /metadata/json/1 directory
The Exchange team is not sure why I need such a directory but the steps in the Technet article are calling for a couple of mailbox scripts to run and I'm getting a 500 Internal Server error when trying to access that Autodiscover URL the script is trying to access.
It cannot be accessed even from the Exchange server but again, Autodiscover in general is working.