Service module contextual filter This answer  from 2 years ago (to which I am not allowed to comment) to the question "How send argument to Services Module (Views+Contextual filters)" contains something about passing contextual filter value to the service module. It is about this URL:

http://test.url/endpoint/path?uid=123


My question here: what exactly is that "path"?
Is that machine name of the view?
To resolve your issue: make sure when the view is created there is no other page or block.

It seems something setup in your MASTER page was causing it to not work. i.e localhost/extra/api/views/service.json?tag=11584