https://www.mediawiki.org/wiki/Extension:LDAP_Authentication/Configuration_Options and https://www.mediawiki.org/wiki/Extension:LDAP_Authentication/Examples mentions $wgAuth which was removed in 1.33 as per https://www.mediawiki.org/wiki/Manual:$wgAuth
So the pages with things like the below, just won't work
require_once( "$IP/extensions/LdapAuthentication/LdapAuthentication.php" ); $wgAuth = new LdapAuthenticationPlugin();
Docs need updating with new examples