When browsing Nature journals via proxy (https://www-nature-com.wikipedialibrary.idm.oclc.org/siteindex), the link to Scientific American redirects to https://www.scientificamerican.com/page/institutional-access/ rather than a correct proxied URL.
We need to expand the Nature Publishing EZProxy group (https://github.com/WikipediaLibrary/twlight_ezproxy/blob/master/expert/ezproxy.cfg#L718) to include this URL pattern.