Does not work on new sites created, only main site

I can't list users from any other site created. I can only list through the main site. All sites created have the "Members" page, as should be (slugs members). But I see work only in the main site. For example:

http://www.mydomain.tld <- Main site (path /), see the list of users on the Members page. Works great.
http://www.mydomain.tld/newsite <- Secondary site (path /newsite/), nothing appears on the Members page.

I'd like to list only the users from that secondary site. Is it possible?

Any idea what could be?