In case you need to use the macro on URLs pointing to the Confluence instance, you should use the tiny URLs. Otherwise (usually) the Confluence built-in autoconverter will take priority in converting the link.

You can determine the tiny URL easily by typing 'k' in the view mode of a page.

Currently labels will not Labels may be determined correctly (i.e. will show the title of the login page) even if the page needs authentication to be accessed. See Authentication for details.