Ok, I might be wrong, but I don’t think the shortcode will let you retrieve values from a user. A shortcode only let you indicate field name and post_id.
But this might point you out in the right direction:
http://www.advancedcustomfields.com/resources/how-to-get-values-from-a-user/
The documentation says:
All the API functions can be used with a user, however, a second parameter is required to target the user ID. This is similar to passing through a post_id to target a specific post object.
The $post_id needed is a string containing “user” + the user ID in this format: “user_$UserID”
You will need to specifiy the user_ID for that. But as I said before, I dont think that’s available in a shortcode.
