wwfve/ww9x_d8 — pull request #1 by Berdir (2014-09-22 10:53:32+00:00)
Title: Remove routing.yml

I'm not sure if this is the cause of the missing route, but there is no need to duplicate the xmlrpc route, that is provided by xmlrpc.module and you integrate with it with hook_xmlrpc(), not through a route.