User blog comment:TimmyQuivy/Opt-In Now Available for HTTPS on FANDOM/@comment-146.200.12.140-20180428220806/@comment-1824272-20180429013837

SSL security certificates only apply for one subdomain level. Alternate language wikis use two subdomain levels.

A security certificate for wikia.com also covers *.wikia.com. However, it does not cover *.*.wikia.com.