I am working with web services and I needed the core_user_get_users function in certain level. But it seems that there is a problem with this function (maybe may configuration) which make the function return the user data if I use the id to search of the user and return nothing if I use something other than the id like username and the other fields.
In the next picture you will see the capability overview of the role assigned to the user of web service :
As you can see I enabled everything required by the core_user_get_users function:
When I made the request in php with the username or anything else I receive this with restformat set to json:
When I use the user id, I get all his info, also it works when I use the email with the value set to "%".
What's the problem here?
Am I missing something?